36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 37.75"w x 37.75"h] Insulated Line + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 22" or 22" x 8" duct opening (measured at the opening)

+ Product Details Size - 16"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 36"h is the size for the duct opening measurement only

10"w X 6"h Is The Size For The Duct Opening Measurement Only

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36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Brown [Outer Dimensions 37.75"w x 37.75"h] Insulated Line + Product Details Perfect Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Perfect Fit & Easy Sizing Designed for a 8" x 22" or 22" x 8" duct opening (measured at the opening) + Product Details Size 16"w X 12"h is the size for the duct opening measurement only