12 inch Shutter Exhaust Fan with Speed & Thermostat Control, 1400 SQ. Ft Cove…

So you no longer have to worry about wiring issues,flexible installation, more convenient to use. High Exhaust Efficiency: Wall mounted exhaust fan has great performance. Aluminum Automatic Shutters Design:Automatic shutter design, the blades automatically open when working, closed when stopping, 100% fully enclosed, no deformation, rust, weatherproof, prevent foreign bodies (dust, rain, mosquitoes) from entering, reduce heat loss and improve energy efficiency.