Class A Ratings
A fire extinguisher rated for class A fires is intended for use on fires involving Ordinary Combustibles such as wood, paper, cloth or plastics. Class A extinguishers are rated from 1 – A through 40 – A. The number in front of the A represents an amount of water or, if another extinguishing agent is used, how much fire that extinguishing agent will put out as compared to the rated amount of water. A Class 1 – A water extinguisher contains 1 1/4 gallons of water; a Class 2 – A extinguisher contains 2 1/2 gallons of water, or twice the 1 – A capacity.
Class B Ratings
A fire extinguisher rated for class B fires is intended for use on fires involving Flammable and Combustible Liquids and Gases such as gasoline, oil, lacquer, paint, mineral spirits and alcohol. Class B extinguishers are rated from 1 – B through 640 – B. The rating is based on the approximate square foot area of a flammable liquid fire that a non-expert operator can extinguish. The non-expert operator is expected to be able to extinguish 1 square foot of fire for each numerical rating or value.
Class C Ratings
A Class C fire is essentially a Class A or B fire where the fuel involved is energized with electricity. A Class C rating confirms that the extinguishing agent will not conduct electricity. The Class C rating is assigned in addition to the rating for Class A and/or Class B fire extinguishers.
Class D Ratings
A fire extinguisher rated for class D fires is intended for use on fires involving Combustible Metals such as aluminum, magnesium, titanium, zirconium, sodium and potassium. A Class D fire extinguisher is rarely needed outside of the industrial or professional firefighting setting.
To put all of this information together, a fire extinguisher with a rating of 2 – A, 10 – BC should extinguish the same amount of fire as a 2 1/2 gallon water extinguisher or extinguish a liquid fire that is 10 square feet in size and the extinguishing agent will not conduct electricity.
Places to buy
Rechargeable – Fire Extinguisher Depot
1 time use – Amazon