when startup,the power is transfered to the fan blade by the motor through the triangular belt to produce strong airflow to open the movable shutter and is able to exhaust the dirty gas out from the chamber within a short time ,when shutdown, the shutter closes automatically to prevent down draught outside of the chamber and prevent dust from entering.

We are a factory especially producing top-quality evaporative air coolers. Our company is founded in 2004 and located in Zhuji city,zhejiang province,we are very near Yiwu city (30 miniutes by car ), can pick up you anytime from Yiwu .
We design and open mould ourselves , our air cooler become serialization: air flow from 3000m³/h to 30000 m³/h.