20"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 31.75"h] w30h30 Ideal for Walls & Ceilings: 4 X 12 Is CRFG2028 Width_14in

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 8" duct openings

actual front end outer dimensions are approximately 28 5/8" width X 24 5/8" height

+ Product Details Size - 6"w X 20"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 32" OR 32" x 30" duct opening (measured at the opening)

+ Product Details Size - 18"w X 6"h X 2"d (for duct opening measurement only)

20"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 31.75"h] w30h30 Ideal for Walls & Ceilings: 4 X 12 Is CRFG2028 Width_14in Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 8" duct openings actual front end outer dimensions are approximately 28 5 8" width X 24 5 8" height