Which NFPA standard governs classification and marking of hazardous materials for fixed facilities?

• A. NFPA 101
• B. NFPA 704
• C. NFPA 472
• D. NFPA 921

Answer: (B)

Hazard classification and at-a-glance marking for materials in fixed facilities are standardized by NFPA 704. This standard defines the familiar fire diamond used on buildings, storage areas, and equipment to communicate three main hazard dimensions: health, flammability, and reactivity, with a white area for special hazards. Each colored field carries a number from 0 to 4, where higher numbers indicate greater hazard. This quick, at-a-glance system is specifically designed for fixed facilities, helping responders and facility staff quickly gauge risk and determine protective actions. The white section can convey special notes, such as oxidizers or water-reactive materials. Other NFPA standards cover different topics—life safety in buildings, responder qualifications, or fire investigation—so they don’t govern the labeling system used at fixed facilities.