28"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 15.75"h] 14in diameter + Product Details Size –

+ Product Details Size – 25"w X 18"h is the size for the duct opening measurement only

+ Product Details Size – 26"w X 36"h is the size for the duct opening measurement only

These Supply Diffusers with integral round necks are recommended for heating

+ Product Details Size - 10"w X 6"h X 2"d (for duct opening measurement only)

+ Product Details Size - 24"w X 26"h X 2"d (for duct opening measurement only)

28"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 15.75"h] 14in diameter + Product Details Size –+ Product Details Size 28"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 15. 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