Which form of fire suppression functions best in an Alaskan fire of burning metals?
a. Dry-pipe sprinkler
b. Wet-pipe sprinkler
c. Carbon dioxide
d. Dry powder
Answer: D
Combustible metal fires (Class D) require sodium chloride and copper-based dry powder extinguishers. Although dry-pipe would be preferable to wet-pipe sprinklers in regions that experience very low temperatures such as Alaska, water is only appropriate for wood, paper, and trash fires (Class A), making answers A and B incorrect. Answer C is incorrect because carbon dioxide and Halon extinguishers are useful for fires involving live electric wiring (Class C) and would not be used for burning metals.