36"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 19.75"h] 18" Round Duct Pipe + Product Details Size –

+ Product Details Size – 32"w X 8"h is the size for the duct opening measurement only

our damper is designed to perfectly align with your setup

The crank handle lever makes it easy to adjust to every weather situation

+ Product Details Size – 10" x 24" or 24" x 10" is the size for the duct opening measurement only

36"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 19.75"h] 18" Round Duct Pipe + Product Details Size –+ Product Details Size 36"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 19. 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