2" Non-Drainable Outdoor Louver Gable Vent (Flange Frame) - Customizable w40h40 + Product Details Size –

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

actual front end outer dimensions are 25" Width X 13" Height

actual front end outer dimensions are 25" width X 25" height

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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 32" Or 32" x 34" duct opening (measured at the opening)

2" Non-Drainable Outdoor Louver Gable Vent (Flange Frame) - Customizable w40h40 + Product Details Size –Our 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.