Fire Extinguisher Requirements Flashcards

Which extinguishing agent is most effective for Class B fires involving asphalt and propane during roofing operations?

Answer: Dry chemical (ABC or BC rated)

Dry chemical extinguishers rated BC or ABC are effective against flammable liquid and gas fires like those involving propane and asphalt.

What is the correct direction to aim the nozzle of a fire extinguisher when fighting a ground-level flammable liquid fire?

Answer: At the base of the fire

You should aim at the base of the fire to attack the fuel source and cut off the combustion process.

A fire extinguisher rated 4-A:80-B:C has a higher Class B rating than one rated 2-A:20-B:C. What does this mean in practice?

Answer: It can suppress a larger flammable liquid fire

A higher B rating means the extinguisher can suppress a greater square footage of flammable liquid fire.

When should the fire guard sweep the nozzle from side to side during extinguisher use?

Answer: During the final 'Sweep' step of PASS

The sweep motion during the last step of PASS ensures full coverage across the base of the fire.

A CO2 extinguisher is used in an enclosed space during a torch operation emergency. What additional precaution must be taken?

Answer: Ventilate the space after use due to oxygen displacement

CO2 displaces oxygen, creating a suffocation hazard in enclosed spaces, so the area must be ventilated after use.

What is the maximum height above ground that a portable fire extinguisher weighing more than 40 lbs may be mounted on a wall bracket?

Answer: 3.5 feet

OSHA and NFPA standards require that extinguishers over 40 lbs be mounted so the handle is no more than 3.5 feet from the floor.

Which condition would cause a fire extinguisher to fail inspection on a torch operation job site?

Answer: The discharge nozzle has a visible crack or obstruction

A cracked or obstructed nozzle prevents proper discharge and is cause for immediate removal from service.