RETA Ammonia Refrigeration Practice Exam

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Which color on the NFPA 704 fire diamond indicates flammability?

Red

The NFPA 704 system uses four colored sections to quick-check hazards: blue for health, red for flammability, yellow for reactivity, and white for special hazards. Flammability is shown by the red section, which also carries a number from 0 to 4 to indicate how easily the material can ignite (0 = no hazard, 4 = very flammable). So the color that signals flammability is red.

Blue

Yellow

White

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