Centriful system can open or close the shutter completely  to ensure the lowest air resistance and biggest air volume. Once the shutter closed tightly,the sealing can efficiency block light and wind into the hen house.

Material of the fan blade is Krupp stailnless steel, it's specially designed for self-cleaning to ensure high efficiency.Big air volume, no deformation, no breakage, no dust, attractive and durable. Thickness:1.2mm; surface finish quality:BA 

French double-row bearings with special waterproof  are used to prevent the entering of water to ensure its high strength,low noise,long life and easy maintenance.

Belts are high quality Japanese Mitsubishi and we are the first to adopt belt B which is three times longer than belt A .

 Linking parts  are made of aluminium alloy  to ensure light weight  and no deformation, Material of tension spring is 304 stainless steel for long life , no deformation and rust.