Hot-dip galvanized plate adopt 275g/ã?¡ galvanized layer, not rust. 95% of the parts are produced by ourselves, reducing the cost of processing, sharing profits with customers, ensuring quality, utmost cost-effective globally Wall-Mounting fan, easy installation and maintenance Belt Drive, Big airflow 1. Material: High quality Nylon PA66 2. Guide Rod: 304 stainless steel with special material outside, high strength, no rust, reduce friction. 3. Rivet: 304 stainless steel , wear-resisting, no rust. Advantage: It can keep the shutters open at complete 90 degree to ensure the lowest air resistance 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, wear resisting, no rust, and flexible. Nylon oriented pole is made of stainless steel, ensuring the high strength and reducing frication, rust-resistant.