36"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 25.75"h] 12in diameter if your hole is 20"

if your hole is 20" wide by 14" tall

75" width X 17

actual front end outer dimensions are approximately 20 5/8" width X 36 5/8" height

actual front end outer dimensions are approximately 22 5/8" width X 42 5/8" height

+ Product Details Size – 34"w X 16"h is the size for the duct opening measurement only

36"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 25.75"h] 12in diameter if your hole is 20"+ Product Details Size 36"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 25. 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