Opening unit is made from advanced nylon,high strength and long service life.
Turning unit with bearing makes the opening process smarter.
When fan starts work, the windows are opened quickly under the centrifugal force.

Customizing order also is welcomed!

Testing report issued by the most professional organization and the best agricultural university in China:

Industry and Agriculture.

Famous logo in Shandong Province

The red cross humanitarian awards

Famous-brand products in Qingdao                   Scientific and technological advancement awards in Pingdu City

Independent innovation awards of  small and medium-sized enterprises (private) in Shandong Province   

High and new technology enterprise certificate