24"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 27.75"h] w8h8 + Product Details Size –

+ Product Details Size – 10"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 14 5/8" height

The 1/2" black insulation

actual front end outer dimensions are approximately 10 5/8" width X 38 5/8" height

Measure the size of the air duct/drywall opening

24"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 27.75"h] w8h8 + Product Details Size –+ Product Details Size 24"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 75" Width X 27. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never