iPower 18-Inch Square Aluminum Automatic Gravity Shutter Louver Vent, Silver,2-Pack

PRODUCT DIMENSION: This 18-Inch Automatic Gravity Shutter’s outer dimension measures 21.26 x 21.26 x 2.76 (Length x Width x Depth), ideal for home, garages, and greenhouses – check the product image for detailed product dimensions.,HIGH-QUALITY ALUMINUM: Louvers made from high-quality aluminum that it’s durable and never corrosion or rust, maintain a neat and smooth surface.,WEATHER PROOF: Precision manufacturing that the louvers can 100% fully close to prevent water from entering. Heavy duty and precision structure enable this Shutter to withstand tropical storm conditions including hurricanes and tornados.,FUNCTIONAL: Automatically open and gravity close. This shutter accompany with an iPower motor and fan blade can help to cool your space and remove excess heat, moisture and dust.,CAUTION: This Automatic Gravity Shutter is sold alone, does not include the exhaust fan blade and motor.