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It is used for exhaust ventilation of hog house and chicken coop. he shell is made of polyethylene, the product is not affected by sunlight and frost. It features strong corrosion resistance and long life. 

Fan leaf material is nylon + glass fiber, with high intensity .

Admission port has the mechanical butterfly structure, which is able to effectively prevent air backflow .

If has rain cover. At 0Pa, the air volume is reduced by 10% with water tray, and at 0Pa, the air volume is reduced by 3% .