NFPA 484-15.3.3.8 labeling requirement for Class A, Class B, or Class C fire extinguishers used in an area were combustible-metal fire hazards are present.
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Label Dry Chemical Fire Extinguishers-Not for Use on Combustible-Metal Fires.
1. A:B:C Dry-Chemical and
B:C Dry-Chemical Extinguishers
Labels
Not for Use on
Combustible-Metal Fires!
NFPA 484-15.3.3.8 labeling requirement for Class A, Class B, or Class C
fire extinguishers used in an area were combustible-metal fire
hazards are present.
Combustible Dust Policy Institute