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Updated requirements permitting universal tanks to be filled in horizontal or vertical orientation provided the positioning slot is correctly oriented
Expanded carbon monoxide detection requirements for new assembly occupancies and new residential board and care occupancies (Chapters 12 and 32)
The 2025 edition introduces new provisions for vacuum dry pipe systems
hazardous materials storage and handling
2021 NFPA 921 Guide for Fire and Explosion Investigations Flammable Liquids Code Updated requirements permitting universal tanksNFPA 921, Guide for Fire and Explosion Investigations 2021 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, and sources of