DC Electric Powered Truck Air Conditioner,Truck Air. 10 05 2022. VDC20F/GB VDC20F/GB vehicle air conditioner is designed for North American Sleeper Trucks, mainly applied in the U.S.A., Canada and Mexico. VDC20F/GU1 This evaporator has only 1 air duct, but the air volume is as high as 585 CFM. VDC20F/GU2 The condenser is back wall mounted, and