The Class B size rating indicates the square footage the 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.Apr 20, 2017
What is BC in a fire extinguisher?
Dry Chemical Extinguishers come in a variety of types. ... "DC" short for "dry chem" • "ABC" indicating that they are designed to extinguish class A,B,and C fires, or • "BC" indicating that they are designed to extinguish class B and C fires.
How much does a 20lb fire extinguisher cost?
List Price: $156.20 Details
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Price: $143.00
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