CHST

The number rating for class A fire extinguishers (1A, 2A, 3A etc.) represents how many gallons of water?

1 1/4 gallons of water

Travel distance from any point of the protected area to the nearest fire extinguisher shall not exceed ____?____ feet.

100 ft

A fire extinguisher, rated not less than 2A, shall be provided for each ____?_____ square feet of the protected building area, or major fraction thereof.

3000 sqft

What are the requirements for fire extinguisher placement wherever more than 5 gallons of flammable or combustible liquids or 5 pounds of flammable gas are being used on the jobsite?

A fire extinguisher, rated not less than 10B, shall be provided within 50 feet

How do Air-pressurized Water Extinguishers (APW) work?

APWs extinguish fire by cooling the surface of the fuel to remove the "heat" element of the fire triangle.

What type of extinguisher is in a silver container?

Air-pressurized Water Extinguisher, APW

Why can you not use CO2 or Dry Chemical - Carbon Dioxide Extinguishers on class A fires?

CO2 is not recommended for Class A fires because they may continue to smolder and re-ignite after the CO2 dissipates.

What type of extinguisher has a hard horn and no pressure gauge?

CO2 or Dry Chemical - Carbon Dioxide Extinguisher

What class of fires do Air-pressurized Water Extinguishers (APW) work on? (Class A, B, C, D K?)

Class A, wood, paper, cloth, rubber, and certain plastics

What class of fires can you use CO2 or Dry Chemical - Carbon Dioxide Extinguishers on? (Class A, B, C, D, K?)

Class B - Flammable liquid & Class C - Electrical fires

What type of fire extinguisher would you expect to find in commercial cooking operations such as restaurants, cafeterias, and other locations where food would be served.

Class K

Class K fires involve what types of materials?

Cooking oils such as in deep-fat fryers

What class of fires do Multi-purpose - Dry Chemical Extinguishers work on?

Dry chemical extinguishers are usually rated for class B and C fires and may be marked multiple purpose for use in A, B, and C fires.

How do Multi-purpose - Dry Chemical Extinguishers work?

Dry chemical extinguishers put out fires by coating the fuel with a thin layer of fire retardant powder, separating the fuel from the oxygen. The powder also works to interrupt the chemical reaction, which makes these extinguishers extremely effective.

Class K extinguishers need to be Inspected, tested and maintained monthly. True or false?

False, Inspect, test and maintain Class K extinguishers annually

Class B fires involve what types of materials?

Flammable liquids

Class C fires involve what types of materials?

Gasses

What types of fires are classified as class D

Metals Fires involving powders, flakes or shavings of combustible metals such as magnesium, titanium, potassium, and sodium require special extinguishers labeled D.

What type of extinguisher contains an extinguishing agent and uses a compressed, non-flammable gas as a propellant.

Multi-purpose - Dry Chemical Extinguishers

What type of extinguisher would you expect to find in public hallways, laboratories, mechanical rooms, break rooms, chemical storage areas, offices, commercial vehicles, and other areas with flammable liquids.

Multi-purpose - Dry Chemical Extinguishers

What are the requirements for fire extinguisher placement in a multi-story building

One or more fire extinguishers, rated not less than 2A, shall be provided on each floor. In multistory buildings, at least one fire extinguisher shall be located adjacent to stairway.

For fire to exist, what 4 elements must be present at the same time?

Oxygen, Fuel, Heat Chemical Reaction Enough oxygen to sustain combustion. Enough heat to raise the material to its ignition temperature. Some sort of fuel or combustible material. The chemical reaction that is fire.

The number rating for class B fire extinguishers (20B, 100B, etc.) represents what?

The square footage that extinguisher can cover. 20B means that as long as you sweep the nozzle side to side, there is enough extinguishing agent inside the canister to provide 20 square feet of coverage.

How do CO2 or Dry Chemical - Carbon Dioxide Extinguishers work?

These extinguishers put out fires by displacing oxygen, or taking away the oxygen element of the fire triangle.

How do CO2 or Dry Chemical - Carbon Dioxide Extinguishers work?

These extinguishers put out fires by displacing oxygen, or taking away the oxygen element of the fire triangle. Because of its high pressure, when you use this extinguisher pieces of dry ice shoot from the horn, which also has a cooling effect on the fire.

A 1/2-inch diameter garden-type hose line, not to exceed 100 feet in length and equipped with a nozzle, may be substituted for a 2A-rated fire extinguisher, providing it is capable of discharging a minimum of 5 gallons per minute with a minimum hose stream range of 30 feet horizontally. True or False?

True

Carbon dioxide extinguishers will frequently be found in industrial vehicles, mechanical rooms, offices, computer labs, and flammable liquid storage areas. True or False?

True

Class K fire extinguishers are only intended to be used after the activation of a built-in hood suppression system. If no commercial cooking system hood and fire suppression system exists, Class K extinguishers are not required. True or False?

True

Extinguishing agents in many Class K extinguishers are electrically conductive. True or False?

True

Never use CO2 extinguishers in a confined space while people are present without proper respiratory protection. True or False?

True

One 55-gallon open drum of water with two fire pails may be substituted for a fire extinguisher having a 2A rating. True or False?

True

Why cant you use an Air-pressurized Water Extinguisher, APW, on a electrical fire?

Water is a good conductor and may lead to electrocution if used to extinguish an electrical fire. Electrical equipment must be unplugged and/or de-energized before using a water extinguisher on an electrical fire.

Why cant you use an Air-pressurized Water Extinguisher, APW, on a flammable liquid fire?

Water is extremely ineffective at extinguishing this type of fire and may make matters worse by the spreading the fire.

Class A fires involve what types of materials?

wood, paper, cloth, rubber, and certain plastics