... quality exhaust fan advantage:1.High capacity of avoiding corrosivity is available and it can be used without staining even in the ... Poultry top quality exhaust fan description: 1. The fan blade is stainless steel, big air flow, without distortion, no broken, attractive ... can not pine and drop.3. The strap wheel adopts is more stiffening rib and processed by sandblasting, become attractive, eliminate ...