Exhaust Fan: Heavy Hammer Fan FJ1250 1.Blade: 430 stainless steel material, thickness 1.2mm. Special blades design ensure large volume, no deformation and no broken. 2.China brand and Siemens motor are available. IP55, Insulation class F. 3. High Strength nylon swung drop hammer opening device to ensure the shutters opening and closing flesibly. 4. Belt Tensioner can ensure the belt working efficiency and good performance.
