AIWFL 20 Inch Aluminum Automatic Gravity Shutter Louver Vent, 2 Pack Square Automatic Exhaust Shutter Louver Vent for Greenhouses, Garages, Attics, Workshops, Barn

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About This 20 Inch Automatic Shutter Louver Vent: Package comes with 2 louver window shutters, the outer dimension of the shutter louver vent measures 22.44 "x22.44" x1.77", suitab le for windows outside, home, garages and greenhouses Automatic Gravity Shutter: 2 pack automatic gravity shutter louver vent, easy to install and maintain. this aluminum shutter can automatically opens and closes with airflow, adapting to different ventilation needs Premium Quality Aluminum: Our gravity shutter louver vent is made of superior quality aluminum that it's strong and sturdy, will not rust or corrode Heavy Duty Shutters: automatic exhaust shutter louver vent can be fully closed to effectively block rain and dust, can withstand harsh weather conditions. Exhaust fan blades and motor are not included Wide Applications: This gravity shutter vent can circulate indoor and outdoor air and can also reduce or increase indoor temperature, great for use in attics, workshops, factories, warehouses, sheds, barns and greenhouses Show more