# What do the letters and numbers mean on a fire extinguisher?

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Extinguishers are classified by a number and letter symbol. The number indicates the relative size of the extinguisher, and the letter indicates the type of fire it will extinguish. … On Type B extinguishers, the number tells you the square footage of the fire the extinguisher can put out.

## How do you read a fire extinguisher rating?

Fire Extinguisher Size Ratings

1. The Class A size rating represents the water equivalency. Each number represents 1 ¼ gallons of water. …
2. The Class B size rating indicates the square footage the extinguisher can cover. …
3. There is no size rating for Class C. …
4. There is also no size rating for Class D fires.

## What does the letter B on a B 1 fire extinguisher indicate?

Answer: The letter “b” indicates it is effective against flammable liquid fires.

## What does 2A 10BC mean?

A fire extinguisher that is rated 2A:10 BC means it has a fire fighting capacity equivalent to: 2.5 Gallons of Water and 10 Square Feet for a BC Type Fire.

## What do the ABC ratings mean on fire extinguishers?

The A, B, C rating system defines the kinds of burning materials each fire extinguisher is designed to fight. The number in front of the A, B, or C indicates the rating size of fire the unit can extinguish.

Fire Extinguisher Ratings.

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Rating Pan Size (sq ft) Gallons of Heptane
40-B 100.0 125.0

## What is the difference between 5BC and 10BC fire extinguisher?

In our tests, the 10BC units discharged only a fraction of a second longer than the 5BC, hardly “twice” anything. The 10BC, on average, discharged only 25% more fire suppressant than the 5BC.

## Which vessel must have a Type B fire extinguisher on board?

Boats less than 26′ have to have at least one B-1 fire extinguisher on board. Boats 26′-40′ need to have at least two B-1 fire extinguishers on board. If the boat has a USCG approved fire extinguisher system installed for protection of the engine compartment, then the required number may be reduced.

## What does the letter B on a B-1 fire extinguisher indicate quizlet?

What does the letter “B” on a B-1 fire extinguisher indicate? The type of fire it is designed to extinguish. What should you do before an inboard gasoline engine? Operate the blower for at least four minutes.

## What is a Type B fire extinguisher used for?

Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering. Class C: Electrical equipment, appliances and wiring in which the use or a nonconductive extinguishing agent prevents injury from electrical shock.

## What is a Type D fire?

Class D fires only involving combustible metals – magnesium, sodium (spills and in depth), potassium, sodium-potassium alloys uranium, and powdered aluminum.