In this case, fires containing wood, plastic, paper, gas, and oil, as well as electrical fires. For the A-rating, the number indicates the water equivalency of the powder in the extinguisher. In our example above, the 4 …
Fire extinguishers with a Class A rating are effective against fires involving paper, wood, textiles, and plastics. The primary chemical used to fight these fires is monoammonium phosphate, because of its ability to smother fires in these types of materials. “B” LIQUIDS.
Understanding Fire Extinguisher Ratings – HSEWatch
The number in front of the A, B, or C indicates the rating size of fire the unit can extinguish. Located on the fire extinguisher label is the UL rating …
Class A: Wood, Paper, cloth, trash, plastics (solids that are not metals). The numerical rating for a Class A Fire extinguisher refers to the amount of chemicals/agent in the extinguisher. The number represents the chemical/agent’s equivalent to gallons of water the extinguisher holds.
People Also Ask a rating on fire extinguisher
How are fire extinguishers rated?
All Fire Extinguishers are tested by the Underwriters Laboratory for safety and performance. They are rated based on the type of fire that they will put out, and their classification is determined by the size of fire they will put out.
What is a Class “A” fire extinguisher?
To achieve a Class “A” rating, the extinguisher must be capable of putting out the wood crib, wood panel and excelsior (shredded paper) tests. Ratings are based on the size of the material that can be repeatedly extinguished.
What does 4A mean on a fire extinguisher?
– The A rating is a water equivalency rating. Each A is equivalent to 1 1/4 gallons of water. 4A = 5 gallons of water. – The B:C rating is equivalent to the amount of square footage that the extinguisher can cover, handled by a professional.
What is the difference between 1A and 2A fire extinguishers?
A higher number means the extinguisher can battle a bigger blaze. A fire extinguisher with a 1A rating is equivalent to 1.25 gallons of water. A 2A rating equals 2.5 gallons of water and a 4A rating equals 5 gallons of water. B-rated fire extinguishers are numbered in 10s.
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Fire Extinguisher UL Rating & Placement as per NFPA 10 Part 1 English Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher