10"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 33.75"h] Compatible with Duct 10" + Product Details Size - 7" Round Duct Pipe CRG828 Product Details Size 14

+ Product Details Size - 24"w X 2"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 22 5/8" height

actual front end outer dimensions are approximately 35

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening)

See our separate listing for Butterfly Dmaper to Control Airflow

10"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 11.75"w x 33.75"h] Compatible with Duct 10" + Product Details Size 7" Round Duct Pipe CRG828 Product Details Size 14 + Product Details Size 24"w X 2"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 32 5 8" width X 22 5 8" height