◆Using advanced front double door opening device, small wind resistance, good sealing,high efficiency.

Lengthened cone design improve exhaust power.

◆Galvanized steel frame is made of 180g/㎡ galvanized layer, avoid rust.

◆Fan double doors closed with the rubber sealing which effctively avoid air backflow when start fans at different time.Greatly improve the operation efficiency by 15-20% compared with the same power fan.