26"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 9.75"h] Return 875" width X 18" height

875" width X 18" height

+ Product Details Size - 36"w X 24"h X 2"d (for duct opening measurement only)

It comes with two versatile mounting base options—solid and ring—making installation simple and flexible

+ Product Details Size - 14"w X 10"h X 2"d (for duct opening measurement only)

875" width X 20" height

26"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 9.75"h] Return 875" width X 18" height+ Product Details Size 26"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 9. 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 wear