***IN STOCK, SHIPS WITHIN 24 HOURS*** These units contain specially fluidized and siliconized mono ammonium phosphate powder which smothers and breaks the chain reaction on Class B fires, fuses and insulates Class A fires, and, as a non-conductor of electricity, is effective on Class C fires. Nomical Capacity 5 lbs. Cylinder Diameter 4 1/4", Overall Height 15 1/4", Overall Width 7 1/4". UL Rating -- 3A-40B:C. Comes with a standard mounting bracket. Service tag by others.