2" Non-Drainable Outdoor Louver Gable Vent (Flange Frame) - Customizable w40h40 + Compatible with the following

+ Compatible with the following brands: Alpine

+ Product Details Size – 16" x 20" or 20" x 16" is the size for the duct opening measurement only

Installing the plaster frame is effortless – secure it into your sheetrock

+ Product Details Size - 16"w X 32"h is the size for the duct opening measurement only

2" Non-Drainable Outdoor Louver Gable Vent (Flange Frame) - Customizable w40h40 + Compatible with the followingOur 2" Aluminum Louver Vent Exterior Air Grille for Walls, Gables & Crawlspaces is Weather Resistant with a Flange Frame. It has blades that prevent water penetration and maximize free area. Features Heavy duty, extruded aluminum flange frame. Fixed, non drainable blades on 2" spacing. J blade design minimizes water ingress while maximizing free area. Nominal 43% free area, based on 48" x 48" louver. Mullions used for sizes over 36" in length.