2" Non-Drainable Outdoor Louver Gable Vent (Flange Frame) - Customizable Brown Design – The collar features

Design – The collar features a smart

Actual Filter Size – 21 3/4"w x 5 3/4" x 1"

+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only

Design – Fixewd hinged for easy filter change & cleaning - uses a 1" thick filter

2" Non-Drainable Outdoor Louver Gable Vent (Flange Frame) - Customizable Brown Design – The collar featuresOur 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.