New DDW Series of Compact Air Handling Unit of Daikin are developed with more advanced technology and production technique on the basis of advantages of previous generation of air handling units. Featuring compact in structure and flexible for assembly, the units can be widely used in commercial and industrial central air conditioning system. Through such processing as air cooling, dewetting and drying, heating and humidifying, and double filtration, the series of units can provide comfortable and clean air-conditioning environment for shopping malls, office buildings, stations, hospitals, and electronics factories. The executive standard for the product is GB/T14294-2008 “Combined air conditioning unit”.