Three most common types of fire extinguishers
Class A-B-C
Class A-B
Class C
Types of fire extinguishers
A
B
C
D
K
Class A Ratings
1A-40A
What is 1A
1.25 Gal of Water
Class B Ratings
1B-640B
What are class B extinguishers based on
Square footage of a fire
Class A for:
Ordinary combustibles
Class B for:
Flammable and combustible liquids and gases
Class C for:
Electrical
Class D for:
Combustible metals
Class K for:
Kitchen(oil fires)
1B means what
1 square foot of fire
Ways fire extinguishers stop fire
Smothering
Cooling
Chemical flame inhibition
What type of water extinguisher can you use on an electrical fire
Stored Pressure MIST
Aqueous film forming foam extinguishers
Class B fires
Clean agent most common
Halogenated extinguishing agents
Dry powder is used for?
Class D
Why do class K extinguishers work?
Saponification of fatty acids to a soapy film
What are clean agents used on?
Class A and B
What does the air-aspirating foam nozzle on AFFF extinguishers do?
Produces better quality foam than a standard extinguisher nozzle
What type of extinguisher to use on computer equipment
Clean agent
After an extinguishing agent has been determined safe and effective on metals what will you find?
Instructions on faceplate