10"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 35.75"h] Brown + Product Details Perfect Fit AD-S-230-10x10 Actual Filter Size 25 Width_8in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 28" or 28" x 8" duct opening (measured at the opening)

+ Product Details Size – 18"w X 12"h is the size for the duct opening measurement only

This Will Create A Cycle Of In And Out Air FLow

actual front end outer dimensions are approximately 32 5/8" width X 12 5/8" height -

+ Product Details Size – 22"w X 14"h is the size for the duct opening measurement only

10"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 11.75"w x 35.75"h] Brown + Product Details Perfect Fit AD S 230 10x10 Actual Filter Size 25 Width_8in + Product Details Perfect Fit & Easy Sizing Designed for a 8" x 28" or 28" x 8" duct opening (measured at the opening) + Product Details Size – 18"w X 12"h is the size for the duct opening measurement only