Model DHC0603D000001S Daikin Packaged units are designed with fast and easy installation in mind and are ideal for both new construction and retrofit projects The direct-drive with airfoil single width, single inlet (SWSI) Class II construction supply fan with aluminum fan +blades provides efficient and quiet operation at wide ranging static pressure and air flow requirements. Daikin packaged rooftop units are made with high quality galvanized steel with a powder-paint finish to provide higher corrosion resistance