32"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 33.75"w x 29.75"h] Powder-Coat The integral design allows you

The integral design allows you to easily adjust the curved blades

+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only

Its professional design and solid construction make it the perfect solution for safeguarding your thermostat against unwanted access

complete with a set of sponge gasket and mounting frame

+ Product Details Size - 34"w X 36"h is the size for the duct opening measurement only

32"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 33.75"w x 29.75"h] Powder-Coat The integral design allows you+ Product Details Size 32"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 33. 75" Width X 29. 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