8"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 21.75"h] Ceiling + Product Details Size –

+ Product Details Size – 16"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 34 5/8" height

+ Product Details Size – 26"w X 14"h is the size for the duct opening measurement only

Quality Packaging – Every part is hand inspected for quality before it is packaged

+ Product Details Size - The listed 6" diameter refers specifically to the size of the duct opening

8"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 21.75"h] Ceiling + Product Details Size –+ Product Details Size 8"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 21. 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