Amerex A411 20 lb. fire extinguisher with wall bracket. ABC or Multi-Purpose extinguishers utilize a specially fluidized and siliconized mono ammonium phosphate dry chemical. It chemically insulates Class A fires by melting at approximately 350°F and coats surface to which it is applied. It smothers and breaks the chain reaction of Class B fires and will not conduct electricity back to the operator. Hose and nozzle design with Anodized Aluminum valve. 10A:120B:C UL & ULC Rating and FM Approved.