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It can keep the shutters open at complete 90 degree to ensure the lowest air resistantce and biggest air volume.
When it is close,the tight sealing can efficiently block light and wind into the poultry house.The fasteners of centrifugal system are copper rivets,wearresisting,no rust,and flexible.Nylon oriented pole is made of stainless steel,ensuring the high strength and reducing frication,rust-resistant.
