Shutter Exhaust Fan, 254 mm High-speed 1400RPM 753 CFM, Aluminum Wall Mount Attic Fan with AC-motor, Ventilation and Cooling for Greenhouses, Garages, Sheds, ShopsShutter Exhaust Fan, 254 mm High speed 1400RPM 753 CFM, Aluminum Wall Mount Attic Fan with AC motor, Ventilation and Cooling for Greenhouses, Garages, Sheds, Shops Product Features New Version What are the differences between the new version and the old one? Firstly, in terms of material, the new model uses full metal material. The louvers, mesh cover, fan body, and even the connecting parts are all made of metal, ensuring a more sturdy product and