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Defining Buildings and their Inherent Characteristics

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Defining Buildings and Inherent Charactoristics

Today’s evolving fireground demands greater insights and an increased understanding of buildings, occupancy risk profiling (ORP) and building anatomy. Recently there has been a movement that has categorized buildings into two groups: engineered and legacy construction.

I strongly believe this is far too limiting and restrictive which is resulting in missed opportunities to develop further insights into other building systems and occupancy risk profiling. In order to refine categories that provide corresponding values related to inherent construction features, systems, collapse and comprise, performance characteristics, fire integrity, resistance etc., the following building anatomy categories are suggested and promoted:

Building Anatomy

Construction Systems

  • Heritage
    • Pre-1900
  • Legacy
    • 1900-1949
  • Conventional
    • 1950-1979
  • Engineered
    • 1980-2001
  • Integrated Hybrid Systems
    • 2002- current …
  • Composite Engineered Systems
    • 2010 – current …

Give some thought to the time spans and the types of buildings at would compromise each group. I’ll post an upcoming article with expanded narrative on each…..

Fire/EMS Safety, Health and Survival Week 2011, Day Six; From Waldbaum’s to Hackensack-Worcester to Charleston; Legacies for Operational Safety

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Fire Service Tradition and The Brotherhood

For those of you that follow or have attended one of my many seminar and lecture program offerings, one program seems very pertinent in both context and content on this, the Sixth Day of Fire/EMS Safety Week 2011 that resonates around the theme and focus of Surviving the Fire Ground – Fire Fighter, Fire Officer and Command Preparedness.

“From Waldbaum’s to Hackensack-Worcester to Charleston; Legacies for Operational Safety”; in most cases, any discussion of these four landmark incidents in the fire service leads directly to a rich discussion and dialog on a myriad of facets, aspects and issues characteristic of the incidents; the time, the place, the circumstances, the names and faces, the deployment, the operations, the challenges and the tragic outcomes.

The legacies of these iconic events as well as so many others of national prominence and impact; and others with lesser national significance, but having far reaching implications, impacts and power on the regional and local levels continue to shine in the remembrance, honor and memory of those impacted by those events and incidents.

I still find it astonishing during my lecture travels around the country lecturing and presenting these programs on building construction and fireground operations, that when those in attendance were posed with a simple question; “What do the Walbaum’s Fire and Hackensack fire share in common?”, the response at times was less than stellar, or at best difficult to solicit let alone convey the commonalities.

The more seasoned and experienced veterans (translation; older firefighters) when present, were able to convey some information on the subject – Some, with a firm and reflected understanding of the question and its ramifications, others not so much. But yet, the true essence of the basic incident particulars and the lessons learned in most cases failed to be fully conveyed. It’s sad to state but; we are not remembering the past!

History Repeating Events-Integrate into your Training

 

Are the fire service legacies of the past and the lessons learned from those incidents and the sacrifices that were made transcending time? Or are they lost in the immediacy of day to day challenges, issues and operations.

Or are these events, lessons and operations issues dismissed and disregarded as a result of their “time and place” not being relevant to “today’s” operations and modern fire service advancements or lack the relevancy to local organizations, operations, make-up and risks. Is it just a “Big City” issue or is it a failure to comprehend the commonality of the event parameters and distill those lessons learned and operations into the essence that is formulative of all of our organizations and operations?

Surviving the Fire Ground – Fire Fighter, Fire Officer and Command Preparedness, has a multitude of facets, features and functional elements. I spoke of some of these commonalities in a previous post this week on Day Two (HERE).

I’ve spoken on numerous occasions about History Repeating Events (HRE), and the common themes related to fire fighter line-of-duty deaths, close-calls, near-misses, maydays and incident operations that had less than desirable outcomes or performance.

These History Repeating Events and incidents on a wide variation of scale, outcome and operations have common issues, apparent and contributing causes and operational factors that share legacy issues that the fire service at times fails to identify, relate to and implement. In other words, (we) fail a times to learn from the past or we make a deliberate choice to ignore those lessons and the apparent similarities and prevailing fireground indicators due to other internal or external influences, pressures, authority, beliefs, values or viewpoints.

What are we Learning? What are we Applying?

We make choices and we determine our direction, path and destiny. Officers, Commanders, Companies fail to connect with situational factors, parallels and signs that have the full potential to direct the incident towards favorable or disastrous conclusions.  The Job isn’t as fatalistic as we sometimes make it out to be.

The prevailing topical areas being addressed this year during Safety week have focused on the mayday component of an incident operation and have included:

  • Preventing the Mayday: situational awareness, planning, size up, air management, fitness for survival, defensive operations.
  • Being Ready for the Mayday: personal safety equipment, communications, accountability systems.
  • Self-Survival Procedures: avoiding panic, mnemonic learning aid “GRAB LIVES”— actions a fire fighter must take to improve survivability, emergency breathing.
  • Self-Survival Skills: SCBA familiarization, emergency procedures, disentanglement, upper floor escape techniques.
  • Fire Fighter Expectations of Command: command-level mayday training, pre-mayday, mayday and rescue, post-rescue, expanding the incident-command system, communications.

There’s ample opportunity this week or in the weeks ahead to do some insightful research or cull some information on the four legacy events we discussed earlier;

  • FDNY Waldbaum’s Fire (1978) HERE and HERE
  • Hackensack (NJ) Auto Dealership Fire (1988) HERE and HERE
  • Worcester (MA) Cold Storage Fire (1999) HERE and HERE
  • Charleston (SC) Sofa Super Store (2007) HERE and HERE

These have tremendous Legacies for Operational Safety, lessons and a wealth of applications for Safety Week and for training, dialog, discussions, tabletops, skillsets and drill activities throughout the entire year.

Integrate the lessons from these as well as other legacies and HRE into your Surviving the Fire Ground – Fire Fighter, Fire Officer and Command Preparedness; training and deliveries. The reality is, we, the present generation of veteran firefighters and officers have the profound obligation and responsibility to recognize the importance of passing along the lessons of the past as well as integrating and playing forward the lessons of our life’s journey throughout our fire service careers; the events of our day and the profound tough lessons and sacrifices learned the hard way. Understand and embrace the shared responsibilities, accountability and requirements that contribute towards Surviving the Fire Ground.

We sometimes need a receptive, sympathetic and compassionate audience that is willing to listen, hear and comprehend the messages conveyed. There needs to be a high degree of empathy related to these past History Repeating Events, the legacies of national, regional and local level prominence. For each event, each and every line of duty death, close-call, near-miss and mayday event has a message and a Legacy of Operational Safety.

Make the time to research, learn and understand the factors of these events, the lessons and opportunities that are borne from each and how they relate to the theme, message and initiatives that make up Fire/EMS Safety, Health and Survival Week and beyond.

Here’s a great Resource from FDNY’s 2011 Safety Initiatives,  SurvivingtheFireground_SafetyWeek2011(2)_0

Prepare for the When, not the IF

Fire/EMS Safety, Health and Survival Week: Day Two- Building Knowledge = Fire Fighter Safety

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Fire/EMS Safety, Health and Survival Week: Day Two- Building Knowledge = Fire Fighter Safety

 

Know Your World Buildingsonfire.com

Other Considerations in Program Planning for Safety Week; Other considerations to support the theme, objectives and initiatives of Safety Week include wide latitude of activities and interactive actions that can achieve the goals for increasing awareness and providing dialog, interaction, training while encouraging discussion and interchange.

These functional area topics can be integrated into planned program development to support the FGS training presentations, delivery and support a comprehensive strategy for integrated Fire Ground Survival training, awareness and insights. These functional areas are supported with references and links to support program develop and deliveries.

Suggested Functional Areas for Alignment with the Theme and Focus during Safety Week;

  • 16 Fire Fighter Life Safety Initiatives

  • Rule of Engagement

  • Fire Fighter Near-Miss Learning‘s

  • Procedures, Policies and Guidelines

  • Pre-Fire Planning

  • Building Construction

  • Structural Systems

  • Occupancy Risk Profiling

  • Fire Dynamics & Fire Behavior

  • Reading Smoke

  • Survivability Profiling

  • Risk Management

  • Crew Resource Management

  • Situational Awareness

  • Disorientation Awareness

  • Structural Collapse & Compromise

  • Mayday & Rapid Intervention

  • Fire Ground Survival

  • Air Resource Management

  • Tactical Patience

  • Go to the Planning Resource Guide for Direct Resources, templates and suggested planning and instructional aids. HERE

Suggested considerations include the following, as well as encouraging fire/EMS departments to identify and integrate local issues, needs and identified gaps or enhancements that can contribute towards operational excellence and safety integration.

  • Review and select a Near Miss Event Report from the National Fire Fighter Near-Miss Reporting System or the Report of the Week (ROTW) series related to functional area topics or mayday actions and discuss the event in a small group or company setting to identify similarities or difference from your our organization. Is your company or department susceptible to a similar event? What should be addressed? http://www.firefighternearmiss.com/
  • Review and select a NIOSH LODD Report from the NIOSH Fire Fighter Fatality Investigation Program related to functional area topics or mayday actions and discuss the event in a small group or company setting to identify similarities or difference from your our organization. Is your company or department susceptible to a similar event? What should be addressed? http://www.cdc.gov/niosh/fire/
  • Take out your Rapid Intervention Equipment and review the purpose and function of each piece of equipment. Identify and discuss alternative uses or tools that can be obtained or used in the event of unavailability, malfunction or additional resource needs. Discuss protocols, procedures, safety awareness and operational hazards, expectations and precautions. Inspection the equipment for operability and integrity.
  • Identify and select a recent departmental or local/regional incident event that was either a near-miss/close-call or transitioned into a mayday event. Discuss and facilitate dialog on lessons learned, gaps, enhancements or operational successes, achievements and positive elements. Identify any factors or elements that were presented in the FGS training series that are applicable to the event, strategies, tactics or operations: can anything be improved or enhanced?
  • Lead a discussion on how to call and initiate a Mayday. Discuss the factors and insights from FGS Program Chapter 3 Self-Survival Procedures and Chapter 4 Self-Survival Skills.
  • Select and lead a discussion on a pertinent incident case study from either the list provided or your own selection and discuss the relevancy of the event in terms of mayday operations, fire ground survival, incident outcome and relationship to your Department or agency. What is the relevancy, similarities or differences? Can this event or circumstances occur in your jurisdiction? What can be done to prevent a history repeating event (HRE)?
  • Review and discuss Roles and Responsibilities for mayday events and operations. How do they match up with your operating procedures, policies and expectations?
  • Develop and facilitate a table top exercise (TTE) on a mayday event scenario utilizing a building in your first-due or response jurisdiction. Take photographs and integrate into your program. Refer to example of a simple TTE attached or go to Fire Fighternation.com for an example here; http://www.firefighternation.com/forum/topics/box-2752reported-fire-in-an
  • Visit a residential or commercial construction site (with pre-arrival authorization and approvals) and tour the stage of construction, looking critically at the type of construction and structural systems being implemented, materials used, workmanship and signs of deficient or adverse conditions that may affect operational integrity, safety or collapse and compromise once the building is occupied.
    • Discuss issues such as structural integrity, collapse risk, occupancy risk versus occupancy type considerations, avenues for fire travel, effects on fire load package and rate of heat release and projected fire intensity.
    • How would you fire a fire in the occupancy? What will define the strategy and tactics that would be or should be selected and used?
  • In a controlled setting with or without PPE, Practice calling a mayday with the identified communication attributes defined in the FGS training program. Critique and practice the evolution until the group feels that it is acceptable.

Understand your Response District

 

“Building Knowledge = Firefighter Safety”, Know Your District and its Risk

Protect Yourself: Your Safety, Health and Survival Are Your Responsibility.

 Within the focus area of Survival and the elements of Structural Size-Up and Situational Awareness, some suggeted key functional components could include the following;

  • Keep apprised of different types of building materials and construction used in your community.
  • The operative question today is this: “What do you “really” know about the buildings in your district?”
  • As you drive about your response district today, coming back from an alarm, heading to the firehouse tonight or running errands around your community, take a good look around. Ask your self a simple question; “How well do you know the buildings, structures and occupancies in your response jurisdiction?”
  • Be honest, do you really understand how those “older residential” structures were built and understand how fire travels and impacts your fireground operations?
  • Are your aware of the newest features of engineered structural support systems being constructed within that new set of homes going up in your second-due area?
  • Are you aware, that vacant office building is being converted into a light manufacturing and assembly business?
  • How about those unoccupied store fronts and businesses that have recently closed up due to the tough economic times…. any special hazards or operational concerns to your company should you get a dispatch to respond?
  • Have the senior members of your station or department shared their stories of operations and incidents at various buildings around your district or community?
  • Did you listen to them, or were you quick to dismiss those “old war stories”. There’s a wealth of “pre-planning’ nuggets hidden in those stories. Take the time to listen, remember or postulate
  • Take a good look around….think about any given building, the one across the street that you’re looking at while you waited for the traffic light to change; Think about a fire in that same building.
  • Do you really understand how it will truly perform under combat structural fire conditions?
  • What’s the building’s collapse profile?
  • How much operational time will you have? Will you need?
  • What’s the fire load package size?
  • What are your concerns for rapid fire extension, extreme fire behavior and vent path issues that amy affect firefighter safety?
  • What dynamic risk assessment factors will you have to deal with?
  • How safe is it for you to engage in interior operations upon your arrival?
  • How can this building, its occupancy and structural system hurt, my team, my company, my firefighters, my department, me?

Sometimes things aren’t as obvious as them seem. You may have responded and operated at numerous incidents at a wide variety of buildings in your response area, or very few; some routine, others maybe more demanding…the question remains, “What do you really know about your buildings?” Your life may one day depend on what you actually do know or recollect. Take a good look around.

Pre-Incident planning is formulative to any effective fire service organization. A good staring point is to look at the NFPA 1620 Recommended Practice for Pre-Incident Planning document. ( NFPA Codes and Standards, HERE)

The purpose of the NFPA 1620 Recommended Practice for Pre-Incident Planning document is to aid in the development of a pre-incident plan to help responding personnel effectively manage emergencies with available resources and should not be confused with fire inspections, which monitor code compliance.

The Pre-Incident Plan document is developed by gathering general and detailed data used by responding emergency service personnel to determine the necessary resources and actions necessary to mitigate anticipated emergencies at a specific facility, structure or occupancy.The Pre-Incident Plan document can contain a variety of useful information related to the construction features and systems, building materials and components, occupancy, layout and floor plan, access/egress, built-in protective, detection and suppression systems, special hazards, fire loading, fire suppression flow needs, pre-determined resource needs, exposure factors, etc.The Pre-Incident Plan document can be as simple or detailed as occupancy and/or operational factors dictate.

The import issue here is that you HAVE Pre-Incident Plan documents available for at the very least targeted or high hazard occupancies and buildings, and that they have been updated at some periodic frequency. There’s nothing worst that arriving at a particular box alarm, pulling open the pre-fire “binder” and finding the occupancy was last planned twenty years ago at best.

The 2007 Deutsche Bank Building fire in lower Manhattan, New York City that resulted in the LODD of FDNY Fr. Joseph Graffagnino and Fr. Robert Beddia, stressed the need for timely and accurate pre-incident plans, when a seven alarm fire progressed through the 40 story high-rise building that was in the process of being deconstructed.An informative Training PDF download is attached that provides Operational Safety Considerations at Demolition and Deconstruction sites.

The full power-point version is available for direct download HERE.

Think about your Buildings and Occupancies and correlate your incident operations using an effect acronym called BECOME SAFE.

Our world has evolved and changed. There are a variety of technological and sociological demands that create a continuing element of change in the built environment and our infrastructure. With these changes and demands come the requirements to assess these vulnerabilities, hazards, threats and dangers with effective and dynamic risk management and competent command and control.

These changes influence the way we do business in the street, the interface-up close and personal with the buildings in your community and equate to the risks and hazards you and your personnel will be confronted with and the level of safety afforded them during incident operations. Dynamic Risk and Command Management and the integration of BECOME SAFE concepts, ingredients for safer operations.

  • Building
  • Evaluation
  • Construction/Occupancy
  • Operational Hazards
  • Manage Time and Elements
  • Engagement
  • Situational Awareness
  • Assessment and Risk Analysis
  • Fire Behavior and Effects
  • Evaluate and Execute

BECOME SAFE Buildingsonfire.com

 

With the advancements in technology, software and programs, there is a vast extent of options and financial levels available to all organizations to develop publish and revise pre-incident planning documents. The key safety message here is that Pre-Fire Plans and Incident Plans can provide a significant margin of support to you during incident operations and can increase firefighter safety, reduce operational risk and aid in the risk management and command management of a give incident.

Regardless of your agency and respond district size, complexity of simplicity, Pre-Incident Plans are a necessary part of modern firefighting and all-hazards operations. An informative planning flow chart is available within the NFPA 1620 document, Figure 4.2.3. ( Order the NFPA 1620 document through the NFPA (HERE)

  • Attached is a copy of the Tempe, AZ Fire Department Pre-Incident Planning SOP
  • The Phoenix, AZ Fire Department Pre-Incident Planning SOP is available HERE
  • An informative Pre-Fire Planning article by Battalion Chief Michael Lee is available HERE

Spend time touring through construction sites as you monitor the progress of a building or occupancy going up.

Look at the manner in which structural support systems are fabricated and assembled. Observe the types of materials that are being used and how they are assembled to form rooms and compartments within the structure.

Take a good look at the manner in which floor and roof systems are constructed, these will become mission critical informational items that can be used to determine your operational profile and formulate your incident action plans. Keep abreast of changes, renovations and alternations to buildings and structures, especially as commercial and business occupancies change owners. These are special areas of concerns on wide latitude of safety and operational considerations.

With the continued challenges in these economic times, pay very close attention to the state of your vacant and unoccupied structures. A change in strategic and tactical deployment considerations MUST be instituted; it shouldn’t be business as usual in these structures.

  • Keep apprised of different types of building materials and construction used in your community.
  • Document those conditions and aspects and train your personnel to understand the occupancies within your community.
  • Understand the Structural AnatomyTM of your buildings and occupancies.
  • The operative response to the opening question this time next year will be this: “What do you “really” know about the buildings in your district?” …The answer will hopefully be…”A lot!”

Are you keeping up the latest construction terminology, materials and methods? Changes are you are not. But I can assure you, somewhere in your community, jurisdiciton, first, second or third-due or mutual aid area; there is new construction features, systems, components and materials being used that will affect the manner you which a structural fire will need to be addressed; The Rules of Structural Fire Suppression have changed- but know has told you…yet.

Of the many issues affecting the Fire Service, the prevailing challenge that has a pronounced impact on operational safety is the assimilation of engineered structural systems (ESS) into mainstream building design and construction. The presence of engineered structural systems (ESS) are no longer considered to be an innocuous feature in a given building or occupancy; it is the predominate feature in nearly all current construction, renovation and adaptive reuse or infill applications. It has become far more than just concerning ourselves with the presence of a simple light-weight or “engineered” truss roof system or a wood I-beam  floor assembly.

There is a new lexicon of building construction components and systems that must be added to your operational safety vocabulary and incident action plans. There is a new terminology, applications and a knowledge base to learn that will support operational excellence and support the integrity of incident safety performance of companies and personnel. Do you know what they represent and how these components, assemblies and systems may affect or influence an incident?

Take a tour of your local construction sites; You’ll be surprised what you’ll see

The fire service continues to apply the term “light weight construction” to a wide variety of building construction and systems. This expression has become a miss-application of both term and the correlation of risk and severity related to operational profiling. In other words, we apply and express the use of “light weight construction” for all types of engineered components, systems, designs and assemblies in nearly all types of building construction and occupancy use.

Although the roots of the term can be traced back to the early 1980′s, and its application to the (then) emerging use of trussed roofing systems and the advent of wood I-beam floor supports (sans solid dimensional lumber joists), the use of the terminology in today’s context of risk assessment, strategic and tactical management and deployment models and within the context of incident operational tactics is no longer applicable, valid or suitable. It must be expanded into a more specific and descriptive level of classification and correlation.

For the most part, when discussing buildings and occupancies, aside from classifications related to code type or class as an element of fire resistance; the emphasis has been to differentiate between conventional and engineered construction, and the application of the term “light weight construction”. I continue advocating and promoting through my lectures that it’s much more than this when looking at the spectrum of construction and the structural anatomy of buildings. Current and past generations of buildings, construction and occupancies can be more accurately differentiated and classified within six (6) expanding categories in the following Building Construction Systems;

  • Heritage:              Pre-1900
  •  Legacy:                1900-1949
  • Conventional:      1950-1979
  • Engineered:         1980-current 2011
  • Blended Hybrid:  2005- current 2011

         
We’ll discuss these six classifications in greater details in a series of future postings and expand the level of details on the CommandSafety.com and Buildingsonfire.com sites.

Our current generation of buildings, construction and occupancies are not as predictable as past “conventional” construction, therefore risk assessment, strategies and tactics must change to address the advancement of new rules of combat structural fire engagement. But if you don’t understand or know what and how those changes in predictability have occurred, you may be operating with a false sense of operational risk and safety margin.

It’s a Lot More than just talking about “Light Weight” Construction….

  • From Plywood-CDX….to
  • Particle Board- PB…..to;
  • Orient Strand Board-OSB
  • Structural Composite Lumber- SCL
  • Laminate Strand Lumber- LSL
  • Laminate Veneer Lumber-LVL
  • Structural Insulated Panels-SIP
  • Parallel Strand Lumber-PSL
  • Machine Stress Rated Lumber- MSR
  • Medium Density Fiberboard-MDF and MDL (Lumber)
  • Finger Jointed Lumber-FJL
  • Adhesives…..
  • Do some research and check these terms out for starters.
  • We’ll talk more about these components and assemblies in the near future. So get busyover the next few days during Safety Week and discover the implications these components may have in your community….

New Materials, New Construction; New Problems

Here’s a link to a past informative posting related to engineered systems and their relationship to firefighter safety and operations, HERE.

There’s some great contributed information and manufacturer “insights” on the subject engineered wood I-joists and beams and firefighter safety. There are some interesting statistical extrapolations, correlations and conveniences’ that attempt to make the case. But then again, You be the judge.

Take at look at the presentation developed by the American Forest and Paper Association, HERE and HERE.
 
If you haven’t done so yet, don’t forget to check out the free online training program on Structural Stability of Engineered Lumber in Fire Conditions at the UL University developed and provided by Underwriter’s Laboratories (UL),  HERE and   Tactical Patience and the New Considerations of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction

Here’s a series of other important Reference Links that provide some insights on operational safety, incident conditions and factors and the lessons-learned from a number of LODD events;  

  • NIOSH Publication No. 2009-114: Preventing Deaths and Injuries of Fire Fighters Working Above Fire-Damaged Floors HERE
  •  NIOSH Publication No. 2005-132: Preventing Injuries and Deaths of Fire Fighters Due to Truss System Failures HERE
  • Volunteer Deputy Fire Chief Dies after Falling Through Floor Hole in Residential Structure during Fire Attack—Indiana, HERE
  • First-floor collapse during residential basement fire claims the life of two fire fighters (career and volunteer) and injures a career fire fighter captain – New York, Report HERE
  • Career Fire Fighter Dies After Falling Through the Floor Fighting a Structure Fire at a Local Residence – Ohio, HERE
  • Colerain Township, Ohio Double LODD Preliminary Report, HERE
  • Career engineer dies and fire fighter injured after falling through floor while conducting a primary search at a residential structure fire – Wisconsin, HERE
  • NFPA Report on Light Weight Construction, HERE
  • Informative USFA Coffee Break series postings related to Building Types & Fire Resistance:  HERE. HEREHERE, HERE, and HERE

 Just Look Over your Shoulder….

I’ve commented with more than a few postings on the issues related to engineer building construction components and assemblies. I posed some questions related to Engineered Structural Assemblies & Systems (ESS) and asked if you knew what they represent and how these components, assemblies and systems may affect or influence incident operations.

I also presented some information on the pioneering efforts and quantitative results of the Underwriters Laboratory (UL) engineers and fire service representatives from the Chicago Fire Department, HERE and HERE.

If you’ve spent any amount of time reading through the NIOSH Fire Fighter Fatality Investigation and Prevention Program, LODD Reports or have invested time and effort to look through the data base of near miss reports and ROTW at the National Firefighter Near-Miss Reporting System, you’d recognize the magnitude of the issues and multi-faceted challenges confronting the U.S. Fire Services in the areas of engineered structural assemblies, components and building features.

Paul Comb’s editorial image provides a poignant and distressing reality that the fire service needs to come to terms with, addressing and implementing the necessary components that assimilating refined combat firefighting techniques and methodologies; that align with the risks and hazards presented by current and emerging construction techniques, materials and consumer lifestyles that comprise our buildings and occupancies. We need to start looking over our shoulders; we need redefined strategies and tactics for today’s buildings and occupancies. When we do have the opportunity to engage in firefighting with the dragon; we may not recognize the dragon has changed, it has evolved. Yet we stand poised to engage or take-on the dragon with faulted incident operations, strategic plans and tactical intentions that provide less than adequate results.

In those situations where we are deficient or we achieved less than expected results, we continue to miss the apparent or root causes and fall back on perceived notions and excuses. Building Knowledge = Firefighter Safety; Understanding today’s building construction, fire dynamics, fire loading and behaviors and instituting appropriate firefighting methodologies, we can achieve safe and successful fireground operations.

Better Look Over your Shoulder

 

  •   Have you and your company, battalion or department discussed limiting factors, enhanced firefighting tactics or operational experiences related to engineered systems, past fires, observed new construction or renovations and what it all means to your assigned duties or company assignments?
  • Are you and your company adequately trained to address “modern” construction, occupancies and conditions or is a much bigger dragon lurking in the shadows?

 Remember, the Predictability of Performance and the combat firefighting based upon Occupancy Risk not Occupany Type.

  

Remember its Occupancy RISK not Occupancy TYPE

 

Here’s the New Formula for Fire Fighter Safety ; Bk = f2S; Building Knowledge = Firefighter Safety

 

STOP THE ENTERTAINMENT

There’s another factor contributing to unsafe practices, one that we rarely talk about. In short, we need to stop “entertaining” ourselves during fire suppression operations and instead focus on comprehending and reacting to evolving risks. Rather than practicing appropriate risk management, it is suggested that some individuals employ adverse behaviors that occur on a tactical level while Incident Commanders and Company Officers believe firefighters are completing their assigned tasks, thus compromising accountability.

These behaviors include;

Tactical amusement: engaging in any practice or tactic during fire suppression, support tasks or operations that places personnel at risk for the sake of entertainment. 

Tactical diversion: diverting from an assignment while engaging in fire suppression, support tasks or operations in such a way that places personnel at risk.

Tactical circumvention: deliberately “getting around” an assignment or disregarding risk assessment and incident action plans.

  

Here’s the expanded versions in case this is the first time you’ve seen them;

TACTICAL AMUSEMENT*tak-ti-kəl ə- *myüz-mənt

1: of or relating to structural fireground tactics: as a (1) a means of amusing or entertaining during fire suppression, support tasks or operations that places personnel at risk

2: the condition of being amused while engaging in fire suppression, support tasks or operations that places personnel at risk

3: pleasurable diversion while engaging in fire suppression, support tasks or operations: entertainment; that places personnel at risk

TACTICAL DIVERSION*tak-ti-kəl də- *vər-zhən

1: the reckless act or an instance of diverting from an assignment, task, operation or activity while engaging in fire suppression, support tasks or operation for the sake of amusing or entertainment; that places personnel at risk

2: the reckless act of self determined task operations that diverts or amuses from defined risk assessment and incident action plans; that places personnel at risk

TACTICAL CIRCUMVENTION*tak-ti-kəl sər-kəm- *ven(t)-shən

1: to deliberately manage to get around especially by ingenuity or approach that diverts for the purpose of amusing; assignment, operations or tasks that countermand or disregard defined risk assessment and incident action plans; that places personnel at risk

  

TACTICAL PATIENCE (NEW) This is a new one that’s called Tactical Patience…I’ll post more on Tactical Patience  later this month.

If we’re going to reduce firefighter injuries and deaths, we must be doing the right thing, at the right time, for the right reasons, and in the right place. We must stop the entertainment.

” The demands and requirements of modern firefighting will continue to require the placement of personnel within situations and buildings that carry risk, uncertainty and inherent danger. Fire suppression tactics must be adjusted for the rapidly changing methods and materials impacting all forms of building construction, occupancies and structures.

The need to redefine the art and science of firefighting is nearly upon us. Some things do stand the test of time, others need to adjust, evolve and change.

Not for the sake of change only, but for the emerging and evolving buildings, structures and occupancies being built, developed or renovated in our communities.

It’s no longer just brute force and sheer physical determination that define structural fire suppression operations.

Aggressive firefighting must be redefined and aligned to the built environment and associated with goal oriented tactical operations that are defined by risk assessed and analyzed tasks that are executed under battle plans that promote the best in safety practices and survivability within know hostile structural fire environments, while maintaining the values and tradition that defines the fire service.”

  

 

Remember one thing…Don’t ever under estimate what you might encounter on any structure fire, or what might change in a second;  focus on the Occupancy Risk not the Occupancy Type….. And Know your buildings, your team and your capabilities

 

 

Remembering FDNY Black Sunday…Multiple Firefighter LODDs January 23, 2005

 

Chicago: Anatomy of a Building and its Collapse

 

Anatomy of a Building and Its Collapse

 

Buildingsonfire.com

Buildingsonfire.com

If you have not had a chance to look over the emerging website, Buildingsonfire.com…take some time to explore…its still under construction, with a wealth of information, research and data today’s Firefighter, Company Officer and command Officer need to know.

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Fire Behavior 101; Taking it to the Streets

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Fire Behavior

Fire Dynamics

Fire Dynamics is the study of how chemistry, fire science, material science and the mechanical engineering disciplines of fluid mechanics and heat transfer interact to influence fire behavior.

In other words, Fire Dynamics is the study of how fires start, spread and develop. But what exactly is a fire?

Defining Fire

Fire can be described in many ways – here are a few:

  • NFPA 921: ”A rapid oxidation process, which is a chemical reaction resulting in the evolution of light and heat in varying intensities.”
  • Webster’s Dictionary: “A fire is an exothermic chemical reaction that emits heat and light”

Fire can also be explained in terms of the Fire Tetrahedron – a geometric representation of what is required for fire to exist, namely, fuel, an oxidizing agent, heat, and an uninhibited chemical reaction.

Measuring Fire

Heat Energy is a form of energy characterized by vibration of molecules and capable of initiating and supporting chemical changes and changes of state (NFPA 921).

In other words, it is the energy needed to change the temperature of an object – add heat, temperature increases; remove heat, temperature decreases.

Heat energy is measured in units of Joules (J), however it can also be measured in Calories (1 Calorie = 4.184 J) and BTU’s (1 BTU = 1055 J).

Temperature is a measure of the degree of molecular activity of a material compared to a reference point.

Temperature is measured in degrees Farenheit (melting point of ice = 32 º F, boiling point of water = 212 º F) or degrees Celsius (melting point of ice = 0 º C, boiling point of water = 100 º C).

º C
º F
Response
37
98.6
 Normal human oral/body temperature
44
111
 Human skin begins to feel pain
48
118
 Human skin receives a first degree burn injury
55
131
 Human skin receives a second degree burn injury
62
140
 A phase where burned human tissue becomes numb
72
162
 Human skin is instantly destroyed
100
212
 Water boils and produces steam
140
284
 Glass transition temperature of polycarbonate
230
446
 Melting temperature of polycarbonate
250
482
 Charring of natural cotton begins
>300
>572
 Charring of modern protective clothing fabrics begins
>600
>1112
 Temperatures inside a post-flashover room fire

Heat Release Rate (HRR) is the rate at which fire releases energy – this is also known as power. HRR is measured in units of Watts (W), which is an International System unit equal to one Joule per second. 

Depending on the size of the fire, HRR is also measured in Kilowatts (equal to 1,000 Watts) or Megawatts (equal 1,000,000 Watts).

Heat Flux is the rate of heat energy transferred per surface unit area – kW/m2.

Heat Flux (kW/m2)
Example
1
Sunny day
2.5
Typical firefighter exposure
3-5
Pain to skin within seconds
20
Threshold flux to floor at flashover
84
Thermal Protective Performance Test (NFPA 1971)
60 – 200
Flames over surface
 
Temperature vs. Heat Release Rate

One candle vs. ten candles – same flame temperature but 10 times the heat release rate!

CANDLE

HRR: ~ 80 W Temperature:
500 C - 1400 C
(930 F - 2500 F)

10 CANDLES

HRR: ~ 800 W

Heat Transfer

Heat transfer is a major factor in the ignition, growth, spread, decay and extinction of a fire.

It is important to note that heat is always transferred from the hotter object to the cooler object - heat energy transferred to and object increases the object’s temperature, and heat energy transferred from and object decreases the object’s temperature.

CONDUCTION

Conduction is heat transfer within solids or between contacting solids.

Conduction          Firefighter Conduction

 

The governing equation for heat transfer by conduction is:

Conduction Equation

Where T is temperature (in Kelvin), A is the exposure area (meters squared), L is the depth of the solid (meters), and k is a constant that unique for different materials know as the thermal conductivity and has units of (Watts/meters*Kelvin).

Thermal Conductivity of Common Materials

Copper = 387
Gypsum = 0.48
Steel = 45.8
Oak = 0.17
Glass = 0.76
Pine = 0.14
Brick = 0.69
PPE = 0.034 – 0.136
Water = 0.58
Air = 0.026

CONVECTION

Convection is heat transfer by the movement of liquids or gasses.

Convection          Firefighter Convection

The governing equation for heat transfer by convection is:

Convection Equation

Where T is temperature (in Kelvin), A is the area of exposure (in meters squared), and h is a constant that is unique for different materials known as the convective heat transfer coefficient, with units of W/m2*K.

These values are found empirically, or, by experiment.

For free convection, values usually range between 5 and 25. But for forced convection, values can range anywhere from 10 to 500.

RADIATION

Radiation is heat transfer by electromagnetic waves.

Radiation          Firefighter Radiation

The governing equation for heat transfer by radiation is:

Radiation Equation

Where T is temperature (in Kelvin), A is the area of exposure (in meters squared), α is the thermal diffusivity (a measure of how quickly a material will adjust it’s temperature to the surroundings, in meters squared per second) and ε is the emissivity (a measure of the ability of a materials surface to emit energy by radiation).

Fire Phenomena

Fire Development is a function of many factors including: fuel properties, fuel quantity, ventilation (natural or mechanical), compartment geometry (volume and ceiling height), location of fire, and ambient conditions (temperature, wind, etc).

Traditional Fire Development
The Traditional Fire Development curve shows the time history of a fuel limited fire. In other words, the fire growth is not limited by a lack of oxygen. As more fuel becomes involved in the fire, the energy level continues to increase until all of the fuel available is burning (fully developed).

Then as the fuel is burned away, the energy level begins to decay.

The key is that oxygen is available to mix with the heated  gases (fuel) to enable the completion of the fire triangle and the generation of energy.

 Fire Development Chart

Watch

Windows: Traditional Fire Development in a Compartment Fire 

Mac: Traditional Fire Development in a Compartment Fire

Fire Behavior in a Structure
The Fire Behavior in a Structure curve demonstrates the time history of a ventilation limited fire. In this case the fire starts in a structure which has the doors and windows closed.Early in the fire growth stage there is adequate oxygen to mix with the heated gases, which results in flaming combustion. As the oxygen level within the structure is depleted, the fire decays, the heat release from the fire decreases and as a result the temperature decreases.

When a vent is opened, such as when the fire department enters a door, oxygen is introduced. 

The oxygen mixes with the heated gases in the structure and the energy level begins to increase.

This change in ventilation can result in a rapid increase in fire growth potentially leading to a flashover (fully developed compartment fire) condition.

 Typical Fire Behavior

Watch

Windows: Fire Behavior in a Structure (Ventilation limited)
Mac: Fire Behavior in a Structure (Ventilation limited)

Flashover is the transition phase in the development of a contained fire in which surfaces exposed to the thermal radiation, from fire gases in excess of 600° C, 

reach ignition temperature more or less simultaneously and fire spreads rapidly through the space.

This is the most dangerous stage of fire development.

Dorm Room Flashover          Room Flashover from Sofa Fire

Videos:

Reports:

Informational Source: The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce. (HERE)

Predictability of Performance: Its Occupancy Risk NOT Occupancy Type

 

 

 

 

 

 

 

 

 

 

 

 

Tactical Patience and the New Considerations of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction

 

UL Ventilation and Fire Behavior Full Scale Testing

 

Impact of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction

For many of you that have been following my writings and perspectives on building construction, firefighting, command risk management and operational excellence for firefighter safety have long recognized that I have been promoting and advocating the fact the fireground is changining, our stratgies and tactics demand change adn does the demand for increased knowledge within the areas of building construction, fire dynamics, while integrating the art and science of firefighting. The most recent release of the testing report from Underwriters Laboratories; Impact of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction and the accompaning emphirical data further validates assumptions and presmises that many of us shared based upon field obervations and first hand incident operations related to the dramatic changes being witnessed as a result of operational challenges in a wide varity of occupanies and building types.

This material is a must read for all emerging and practicing company and command officers ( for starters) to being grasping the magnitude and extent of quantifiable data that supports the premise that combat fire engagement and suppression operations and the rules of engagement are going to change and that change is fast approaching.

Considerations for Tactical Patience and Adaptive Fireground Management are continued themes I will expand upon in future postings….

Here’s the executive summary of the report and findings from UL. For an download of the entire UL Report, go HERE.

Under the United States Department of Homeland Security (DHS) Assistance to Firefighter Grant Program, Underwriters Laboratories examined fire service ventilation practices as well as the impact of changes in modern house geometries. There has been a steady change in the residential fire environment over the past several decades. These changes include larger homes, more open floor plans and volumes and increased synthetic fuel loads. This series of experiments examine this change in fire behavior and the impact on firefighter ventilation tactics. This fire research project developed the empirical data that is needed to quantify the fire behavior associated with these scenarios and result in immediately developing the necessary firefighting ventilation practices to reduce firefighter death and injury.

Two houses were constructed in the large fire facility of Underwriters Laboratories in Northbrook, IL. The first of two houses constructed was a one-story, 1200 ft2, 3 bedroom, 1 bathroom house with 8 total rooms. The second house was a two-story 3200 ft2, 4 bedroom, 2.5 bathroom house with 12 total rooms. The second house featured a modern open floor plan, two-story great room and open foyer. Fifteen experiments were conducted varying the ventilation locations and the number of ventilation openings. Ventilation scenarios included ventilating the front door only, opening the front door and a window near and remote from the seat of the fire, opening a window only and ventilating a higher opening in the two-story house. One scenario in each house was conducted in triplicate to examine repeatability.

The results of these experiments provide knowledge for the fire service for them to examine their thought processes, standard operating procedures and training content. Several tactical considerations were developed utilizing the data from the experiments to provide specific examples of changes that can be adopted based on a departments current strategies and tactics.

Under the United States Department of Homeland Security (DHS) Assistance to Firefighter Grant Program, Underwriters Laboratories examined fire service ventilation practices as well as the impact of changes in modern house geometries.

There has been a steady change in the residential fire environment over the past several decades. These changes include larger homes, more open floor plans and volumes and increased synthetic fuel loads. This series of experiments examine this change in fire behavior and the impact on firefighter ventilation tactics.

This fire research project developed the empirical data that is needed to quantify the fire behavior associated with these scenarios and result in immediately developing the necessary firefighting ventilation practices to reduce firefighter death and injury.

  • Two houses were constructed in the large fire facility of Underwriters Laboratories in Northbrook, IL.
  • The first of two houses constructed was a one-story, 1200 ft2, 3 bedroom, 1 bathroom house with 8 total rooms.
  • The second house was a two-story 3200 ft2, 4 bedroom, and 2.5 bathroom house with 12 total rooms.
  • The second house featured a modern open floor plan, two story great room and open foyer.

 Fifteen experiments were conducted varying the ventilation locations and the number of ventilation openings. Ventilation scenarios included ventilating the front door only, opening the front door and a window near and remote from the seat of the fire, opening a window only and ventilating a higher opening in the two-story house.

One scenario in each house was conducted in triplicate to examine repeatability. The results of these experiments provide knowledge for the fire service for them to examine their thought processes, standard operating procedures and training content. Several tactical considerations were developed utilizing the data from the experiments to provide specific examples of changes that can be adopted based on a departments current strategies and tactics.

The tactical considerations addressed include:

  • Stages of fire development:The stages of fire development change when a fire becomes ventilation limited.
    • It is common with today’s fire environment to have a decay period prior to flashover which emphasizes the importance of ventilatio
  • Forcing the front door is ventilation: Forcing entry has to be thought of as ventilation as well.
    • While forcing entry is necessary to fight the fire it must also trigger the thought that air is being fed to the fire and the clock is ticking before either the fire gets extinguished or it grows until an untenable condition exists jeopardizing the safety of everyone in the structure.
  • No smoke showing:A common event during the experiments was that once the fire became ventilation limited the smoke being forced out of the gaps of the houses greatly diminished or stopped all together.
    • No some showing during size-up should increase awareness of the potential conditions inside.
  • Coordination:If you add air to the fire and don’t apply water in the appropriate time frame the fire gets larger and safety decreases.
    • Examining the times to untenability gives the best case scenario of how coordinated the attack needs to be.
    • Taking the average time for every experiment from the time of ventilation to the time of the onset of firefighter untenability conditions yields 100 seconds for the one-story house and 200 seconds for the two-story house
    • In many of the experiments from the onset of firefighter untenability until flashover was less than 10 seconds.
    • These times should be treated as being very conservative. If a vent location already exists because the homeowner left a window or door open then the fire is going to respond faster to additional ventilation opening because the temperatures in the house are going to be higher.
    • Coordination of fire attack crew is essential for a positive outcome in today’s fire environment.
  • Smoke tunneling and rapid air movement through the front door:Once the front door is opened attention should be given to the flow through the front door.
    • A rapid in rush of air or a tunneling effect could indicate a ventilation limited fire.
  • Vent Enter Search (VES):During a VES operation, primary importance should be given to closing the door to the room.
    • This eliminates the impact of the open vent and increases tenability for potential occupants and firefighters while the smoke ventilates from the now isolated room.
  • Flow paths: Every new ventilation opening provides a new flow path to the fire and vice versa.
    • This could create very dangerous conditions when there is a ventilation limited fire.
  • Can you vent enough?:In the experiments where multiple ventilation locations were made it was not possible to create fuel limited fires.
    • The fire responded to all the additional air provided.
    • That means that even with a ventilation location open the fire is still ventilation limited and will respond just as fast or faster to any additional air.
    • It is more likely that the fire will respond faster because the already open ventilation location is allowing the fire to maintain a higher temperature than if everything was closed. In these cases rapid fire progression if highly probable and coordination of fire attack with ventilation is paramount.
  • Impact of shut door on occupant tenability and firefighter tenability:Conditions in every experiment for the closed bedroom remained tenable for temperature and oxygen concentration thresholds.
    • This means that the act of closing a door between the occupant and the fire or a firefighter and the fire can increase the chance of survivability.
    • During firefighter operations if a firefighter is searching ahead of a hoseline or becomes separated from his crew and conditions deteriorate then a good choice of actions would be to get in a room with a closed door until the fire is knocked down or escape out of the room’s window with more time provided by the closed door
  • Potential impact of open vent already on flashover time:All of these experiments were designed to examine the first ventilation actions by an arriving crew when there are no ventilation openings.
    • It is possible that the fire will fail a window prior to fire department arrival or that a door or window was left open by the occupant while exiting.
    • It is important to understand that an already open ventilation location is providing air to the fire, allowing it to sustain or grow.
  • Pushing fire:There were no temperature spikes in any of the rooms, especially the rooms adjacent to the fire room when water was applied from the outside. It appears that in most cases the fire was slowed down by the water application and that external water application had no negative impacts to occupant survivability.
    • While the fog stream “pushed” steam along the flow path there was no fire “pushed”.
  • No damage to surrounding rooms:Just as the fire triangle depicts, fire needs oxygen to burn.
    • A condition that existed in every experiment was that the fire (living room or family room) grew until oxygen was reduced below levels to sustain it.
    • This means that it decreased the oxygen in the entire house by lowering the oxygen in surrounding rooms and the more remote bedrooms until combustion was not possible.
    • In most cases surrounding rooms such as the dining room and kitchen had no fire in them even when the fire room was fully involved in flames and was ventilating out of the structure.

Online Training Program

In order to make the results of this study more user friendly for the fire service to examine, UL developed an online interactive training module that can be viewed by clicking here. The program includes a professionally narrated description of all of the experiments, their results and the tactical considerations. Experimental video is used and graphical data is explained in a way that brings science to the street level firefighter.

UL University On-Line CBT

 

Comparison of Modern and Legacy Home Furnishings

An experiment was conducted with two side by side living room fires. The purpose was to gain knowledge on the difference between modern and legacy furnishings. The rooms measured 12 ft by 12 ft, with an 8 ft ceiling and had an 8 ft wide by 7 ft tall opening on the front wall. Both rooms contained similar amounts of like furnishings.

The modern room was lined with a layer of ½ inch painted gypsum board and the floor was covered with carpet and padding.

  • The furnishings included a microfiber covered polyurethane foam filled sectional sofa, engineered wood coffee table, end table, television stand and book case.
  • The sofa had a polyester throw placed on its right side. The end table had a lamp with polyester shade on top of it and a wicker basket inside it.
  • The coffee table had six color magazines, a television remote and a synthetic plant on it.
  • The television stand had a color magazine and a 37 inch flat panel television.
  • The book case had two small plastic bins, two picture frames and two glass vases on it.
  • The right rear corner of the room had a plastic toy bin, a plastic toy tub and four stuffed toys.
  • The rear wall had polyester curtains hanging from a metal rod and the side walls had wood framed pictures hung on them.

The legacy room was lined with a layer of ½ inch painted cement board and the floor was covered with unfinished hardwood flooring.

  • The furnishings included a cotton covered, cotton batting filled sectional sofa, solid wood coffee table, two end tables, and television stand.
  • The sofa had a cotton throw placed on its right side.
  • Both end tables had a lamp with polyester shade on top of them.
  • The one on the left side of the sofa had two paperback books on it.
  • A wicker basket was located on the floor in front of the right side of the sofa at the floor level.
  • The coffee table had three hard-covered books, a television remote and a synthetic plant on it.
  • The television stand had a 27 inch tube television.
  • The right front corner of the room had a wood toy bin, and multiple wood toys.
  • The rear wall had cotton curtains hanging from a metal rod and the side walls had wood framed pictures hung on them.

Both rooms were ignited by placing a lit stick candle on the right side of the sofa. The fires were allowed to grow until flashover. The modern room transitioned to flashover in 3 minutes and 30 seconds and the legacy room at 29 minutes and 30 seconds.

View the entire video, or you may also download the video:

Tactical Patience and the New Considerations of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction

7 comments

UL Ventilation and Fire Behavior Full Scale Testing

Impact of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction

For many of you that have been following my writings and perspectives on building construction, firefighting, command risk management and operational excellence for firefighter safety have long recognized that I have been promoting and advocating the fact the fireground is changining, our stratgies and tactics demand change adn does the demand for increased knowledge within the areas of building construction, fire dynamics, while integrating the art and science of firefighting. The most recent release of the testing report from Underwriters Laboratories; Impact of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction and the accompaning emphirical data further validates assumptions and presmises that many of us shared based upon field obervations and first hand incident operations related to the dramatic changes being witnessed as a result of operational challenges in a wide varity of occupanies and building types. This material is a must read for all emerging and practicing company and command officers ( for starters) to being grasping the magnitude and extent of quantifiable data that supports the premise that combat fire engagement and suppression operations and the rules of engagement are going to change and that change is fast approaching. Considerations for Tactical Patience and Adaptive Fireground Management are continued themes I will expand upon in future postings….

Here’s the executive summary of the report and findings from UL. For an download of the entire UL Report, go HERE.

Under the United States Department of Homeland Security (DHS) Assistance to Firefighter Grant Program, Underwriters Laboratories examined fire service ventilation practices as well as the impact of changes in modern house geometries.  There has been a steady change in the residential fire environment over the past several decades.  These changes include larger homes, more open floor plans and volumes and increased synthetic fuel loads.  This series of experiments examine this change in fire behavior and the impact on firefighter ventilation tactics.  This fire research project developed the empirical data that is needed to quantify the fire behavior associated with these scenarios and result in immediately developing the necessary firefighting ventilation practices to reduce firefighter death and injury.

Two houses were constructed in the large fire facility of Underwriters Laboratories in Northbrook, IL.  The first of two houses constructed was a one-story, 1200 ft2, 3 bedroom, 1 bathroom house with 8 total rooms.  The second house was a two-story 3200 ft2, 4 bedroom, 2.5 bathroom house with 12 total rooms.  The second house featured a modern open floor plan, two-story great room and open foyer.   Fifteen experiments were conducted varying the ventilation locations and the number of ventilation openings.  Ventilation scenarios included ventilating the front door only, opening the front door and a window near and remote from the seat of the fire, opening a window only and ventilating a higher opening in the two-story house.  One scenario in each house was conducted in triplicate to examine repeatability.

The results of these experiments provide knowledge for the fire service for them to examine their thought processes, standard operating procedures and training content.  Several tactical considerations were developed utilizing the data from the experiments to provide specific examples of changes that can be adopted based on a departments current strategies and tactics.

Under the United States Department of Homeland Security (DHS) Assistance to Firefighter Grant Program, Underwriters Laboratories examined fire service ventilation practices as well as the impact of changes in modern house geometries.

There has been a steady change in the residential fire environment over the past several decades. These changes include larger homes, more open floor plans and volumes and increased synthetic fuel loads. This series of experiments examine this change in fire behavior and the impact on firefighter ventilation tactics.

This fire research project developed the empirical data that is needed to quantify the fire behavior associated with these scenarios and result in immediately developing the necessary firefighting ventilation practices to reduce firefighter death and injury.

  • Two houses were constructed in the large fire facility of Underwriters Laboratories in Northbrook, IL.
  • The first of two houses constructed was a one-story, 1200 ft2, 3 bedroom, 1 bathroom house with 8 total rooms.
  • The second house was a two-story 3200 ft2, 4 bedroom, and 2.5 bathroom house with 12 total rooms.
  • The second house featured a modern open floor plan, two story great room and open foyer.

Fifteen experiments were conducted varying the ventilation locations and the number of ventilation openings. Ventilation scenarios included ventilating the front door only, opening the front door and a window near and remote from the seat of the fire, opening a window only and ventilating a higher opening in the two-story house.

One scenario in each house was conducted in triplicate to examine repeatability. The results of these experiments provide knowledge for the fire service for them to examine their thought processes, standard operating procedures and training content. Several tactical considerations were developed utilizing the data from the experiments to provide specific examples of changes that can be adopted based on a departments current strategies and tactics.

The tactical considerations addressed include:

  • Stages of fire development: The stages of fire development change when a fire becomes ventilation limited.
    • It is common with today’s fire environment to have a decay period prior to flashover which emphasizes the importance of ventilation.
  • Forcing the front door is ventilation: Forcing entry has to be thought of as ventilation as well.
    • While forcing entry is necessary to fight the fire it must also trigger the thought that air is being fed to the fire and the clock is ticking before either the fire gets extinguished or it grows until an untenable condition exists jeopardizing the safety of everyone in the structure.
  • No smoke showing: A common event during the experiments was that once the fire became ventilation limited the smoke being forced out of the gaps of the houses greatly diminished or stopped all together.
    • No some showing during size-up should increase awareness of the potential conditions inside.
  • Coordination: If you add air to the fire and don’t apply water in the appropriate time frame the fire gets larger and safety decreases.
    • Examining the times to untenability gives the best case scenario of how coordinated the attack needs to be.
    • Taking the average time for every experiment from the time of ventilation to the time of the onset of firefighter untenability conditions yields 100 seconds for the one-story house and 200 seconds for the two-story house
    • In many of the experiments from the onset of firefighter untenability until flashover was less than 10 seconds.
    • These times should be treated as being very conservative. If a vent location already exists because the homeowner left a window or door open then the fire is going to respond faster to additional ventilation opening because the temperatures in the house are going to be higher.
    • Coordination of fire attack crew is essential for a positive outcome in today’s fire environment.
  • Smoke tunneling and rapid air movement through the front door: Once the front door is opened attention should be given to the flow through the front door.
    • A rapid in rush of air or a tunneling effect could indicate a ventilation limited fire.
  • Vent Enter Search (VES): During a VES operation, primary importance should be given to closing the door to the room.
    • This eliminates the impact of the open vent and increases tenability for potential occupants and firefighters while the smoke ventilates from the now isolated room.
  • Flow paths: Every new ventilation opening provides a new flow path to the fire and vice versa.
    • This could create very dangerous conditions when there is a ventilation limited fire.
  • Can you vent enough?: In the experiments where multiple ventilation locations were made it was not possible to create fuel limited fires.
    • The fire responded to all the additional air provided.
    • That means that even with a ventilation location open the fire is still ventilation limited and will respond just as fast or faster to any additional air.
    • It is more likely that the fire will respond faster because the already open ventilation location is allowing the fire to maintain a higher temperature than if everything was closed. In these cases rapid fire progression if highly probable and coordination of fire attack with ventilation is paramount.
  • Impact of shut door on occupant tenability and firefighter tenability: Conditions in every experiment for the closed bedroom remained tenable for temperature and oxygen concentration thresholds.
    • This means that the act of closing a door between the occupant and the fire or a firefighter and the fire can increase the chance of survivability.
    • During firefighter operations if a firefighter is searching ahead of a hoseline or becomes separated from his crew and conditions deteriorate then a good choice of actions would be to get in a room with a closed door until the fire is knocked down or escape out of the room’s window with more time provided by the closed door
  • Potential impact of open vent already on flashover time: All of these experiments were designed to examine the first ventilation actions by an arriving crew when there are no ventilation openings.
    • It is possible that the fire will fail a window prior to fire department arrival or that a door or window was left open by the occupant while exiting.
    • It is important to understand that an already open ventilation location is providing air to the fire, allowing it to sustain or grow.
  • Pushing fire: There were no temperature spikes in any of the rooms, especially the rooms adjacent to the fire room when water was applied from the outside. It appears that in most cases the fire was slowed down by the water application and that external water application had no negative impacts to occupant survivability.
    • While the fog stream “pushed” steam along the flow path there was no fire “pushed”.
  • No damage to surrounding rooms: Just as the fire triangle depicts, fire needs oxygen to burn.
    • A condition that existed in every experiment was that the fire (living room or family room) grew until oxygen was reduced below levels to sustain it.
    • This means that it decreased the oxygen in the entire house by lowering the oxygen in surrounding rooms and the more remote bedrooms until combustion was not possible.
    • In most cases surrounding rooms such as the dining room and kitchen had no fire in them even when the fire room was fully involved in flames and was ventilating out of the structure.

Online Training Program

In order to make the results of this study more user friendly for the fire service to examine, UL developed an online interactive training module that can be viewed by clicking here.  The program includes a professionally narrated description of all of the experiments, their results and the tactical considerations.  Experimental video is used and graphical data is explained in a way that brings science to the street level firefighter.

UL University On-Line CBT

Comparison of Modern and Legacy Home Furnishings

An experiment was conducted with two side by side living room fires.   The purpose was to gain knowledge on the difference between modern and legacy furnishings.  The rooms measured 12 ft by 12 ft, with an 8 ft ceiling and had an 8 ft wide by 7 ft tall opening on the front wall.  Both rooms contained similar amounts of like furnishings.

The modern room was lined with a layer of ½ inch painted gypsum board and the floor was covered with carpet and padding.

  • The furnishings included a microfiber covered polyurethane foam filled sectional sofa, engineered wood coffee table, end table, television stand and book case.
  • The sofa had a polyester throw placed on its right side.  The end table had a lamp with polyester shade on top of it and a wicker basket inside it.
  • The coffee table had six color magazines, a television remote and a synthetic plant on it.
  • The television stand had a color magazine and a 37 inch flat panel television.
  • The book case had two small plastic bins, two picture frames and two glass vases on it.
  • The right rear corner of the room had a plastic toy bin, a plastic toy tub and four stuffed toys.
  • The rear wall had polyester curtains hanging from a metal rod and the side walls had wood framed pictures hung on them.

The legacy room was lined with a layer of ½ inch painted cement board and the floor was covered with unfinished hardwood flooring.

  • The furnishings included a cotton covered, cotton batting filled sectional sofa, solid wood coffee table, two end tables, and television stand.
  • The sofa had a cotton throw placed on its right side.
  • Both end tables had a lamp with polyester shade on top of them.
  • The one on the left side of the sofa had two paperback books on it.
  • A wicker basket was located on the floor in front of the right side of the sofa at the floor level.
  • The coffee table had three hard-covered books, a television remote and a synthetic plant on it.
  • The television stand had a 27 inch tube television.
  • The right front corner of the room had a wood toy bin, and multiple wood toys.
  • The rear wall had cotton curtains hanging from a metal rod and the side walls had wood framed pictures hung on them.

Both rooms were ignited by placing a lit stick candle on the right side of the sofa.  The fires were allowed to grow until flashover.  The modern room transitioned to flashover in 3 minutes and 30 seconds and the legacy room at 29 minutes and 30 seconds.

View the entire video, or you may also download the video: