20″ Automatic Aluminum Exhaust Shutter Louvers for Home & Greenhouse Ventilation
Gravity Shutter Louver Vent: The gravity shutter vent has 10 blades that open automatically with the airflow and close by gravity to suit different ventilation needs. Automatic Shutter Louver Vent: YAGEANNL Shutter 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.