YAGEANNL 18 Inch Automatic Gravity Shutter Louver Vent, Aluminum Exhaust Shutters Louver for Windows Outside, Home Attics, Greenhouse Vent

Automatic Shutter Louver Vent: YAGEANNL Shutter louver vents for outside windows are carefully made of high-quality aluminum, easy to install and maintain, sturdy, corrosion-resistant, and keep the surface clean and smooth. 1Pcs Shutter Vent Size: 18 Inch automatic gravity blinds, the dimensions of each are 20.7 x 20.7 x 1.8 inches / 52.5 x 52.5 x 4.5 cm, including 1 shutter vents. Very suitable for home, workshop, warehouse, greenhouse use. Gravity Shutter Louver Vent: Gravity shutter vent has 10 blades that open automatically with the airflow and close by gravity to suit different ventilation needs.. Closeable Protective Shutter Bents: Precision-made shutter vents can be completely closed, effectively blocking wind, rain, and insects. High-quality manufacturing makes this shutter vent effective in protecting against bad weather.. Only One Shutter Vents: Note that this YAGEANNL automatic shutter vent is sold separately and does not include the exhaust fan blades and motor.