28"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 9.75"h] w22h22 + Product Details Size -

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

Installs Directly On Round & Oval Spiral Duct - No Frames

actual front end outer dimensions are approximately 37

+ Product Details Size – 30"w X 26"h is the size for the duct opening measurement only

+ Product Details Size – 10" x 18" or 18" x 10" is the size for the duct opening measurement only

28"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 9.75"h] w22h22 + Product Details Size -+ Product Details Size 28"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 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