三级自拍无码中文_美女黄色一级毛片_高清免费电影大全网站_是一個優秀的影視資源網站_日本美女高清在线观看免费_台湾峰昌机械_亚洲成人丰满熟妇麻豆_国产精品网你懂的_日韩小视频在线播放_国产精品无不卡av在线

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% .