34"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 27.75"h] Compatible With Duct 8in Adjustable airflow control – Adjustable

Adjustable airflow control – Adjustable airflow control: The system allows users to customize the amount of air supply

+ Product Details Size - 18"w X 36"h is the size for the duct opening measurement only

The unique sponge gasket ensures an airtight seal

Dimensions With Outer End are 15

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 26" OR 26" x 18" duct opening (measured at the opening)

34"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 27.75"h] Compatible With Duct 8in Adjustable airflow control – Adjustable+ Product Details Size 34"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 35. 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