Unruh ARFF skid units are custom-made to order. Its 100 to 300 gallons of TRI-MAX High Energy Cold Compressed Air Foam (HECCAF) produces up to 4 times more finished foam than conventional CAF systems. The 500 lb. dry chemical system features Encapsulated Dry Chemical nozzle technology that places agent precisely on target for better control of pressure fed running fuel fires.