6"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 7.75"w x 7.75"h] return grille + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246

+ Product Details Size – 6" x 22" or 22" x 6" is the size for the duct opening measurement only

+ Product Details Size – 30"w X 14"h is the size for the duct opening measurement only

75"H – fits a 18" X 4" duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 26" Or 26" x 34" duct opening (measured at the opening)

actual front end outer dimensions are approximately 16 5/8" width X 10 5/8" height -

6"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Black [Outer Dimensions 7.75"w x 7.75"h] return grille + Product Details Size – Compatible with Duct 4" Product Details Size 32 LO246 + Product Details Size – 6" x 22" or 22" x 6" is the size for the duct opening measurement only + Product Details Size – 30"w X 14"h is the size for the duct opening measurement only