High Expansion Foam. Class "A" or Class "B", A unique product offering unmatched versatility coupled with good economics. Designed to be used at 1/2 to 1% flow with any standard foam system or compressed air foam system for class "A" fire fighting, or through a foam generator for room filling billowy foam "A, B & C" situations. This same product can be used through standard foam equipment an at 3% flow for most class "B" situations, including small flammable liquid spills. Usage with salt or fresh water, indefinite shelf life, versatility, and low cost make this product a must for every firefighting agency.