2024 NFPA 921 Guide for Fire and Explosion Investigations

NFPA 921, Guide for Fire and Explosion Investigations 2024 edition provides the scientific framework for conducting fire and explosion investigations — from establishing origin and cause through documenting findings for legal proceedings. The guide covers application of the scientific method in origin and cause investigations, evidence collection and handling for court admissibility, fire pattern analysis, arc mapping, explosion dynamics, wildfire investigations, and sources of investigative information. NFPA 921 is recognized by the Organization of Scientific Area Committees (OSAC) as the forensic science consensus guide for fire investigations and is widely referenced in litigation to support or challenge the validity of investigative conclusions. The 2024 edition expands coverage of investigator bias, EV fire investigations, wildfire investigations, and suppression activity impacts on fire behavior.

Important Note on Document Type

NFPA 921 is a guide, not a mandatory code. It provides recommended scientific methods and best practices rather than enforceable requirements. It is widely used as the accepted standard of care in fire investigation practice and legal proceedings.

Who Uses NFPA 921

Used by fire investigators, forensic scientists, insurance investigators, fire marshals, law enforcement personnel, and attorneys involved in origin and cause investigations, litigation support, and insurance claims involving fire and explosion incidents.

What's New in the 2024 Edition

The 2024 edition expands investigator guidance, fire cause classifications, and vehicle fire investigation coverage, including:

• Additional guidance on investigator confirmation bias, opinions, and expressions of certainty.
• New coverage of the impact of suppression activities on fire ventilation and flow path remote from the area of origin.
• Relocation of all fire effects on electrical systems and components consolidated into Chapter 6.
• Four general classifications of fire causes added for investigators and AHJ officials.
• Additional guidance on fire investigator safety, health, and wellness.
• Expanded coverage of fires involving hybrid electric vehicles (HEVs) and electric vehicles (EVs).
• Revised wildfire investigations chapter including new terminology and unique fire indicators associated with wildfire investigations.

Stay current with the forensic science consensus methods for fire and explosion investigations.

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