Ipower 20-Inch Square Aluminum Automatic Gravity Shutter Louver Vent

Louver Shutters by iPower. Details:iPower 12-Inch Square Automatic Gravity Shutter. Outer dimension measures 23.43″ x 23.43″ x 2.76″ (Length x Width x Depth), and inner dimension measures 20.47″ x 20.47″. Product made from heavy-duty and high-quality aluminum. Fan blade and motor are not included.