12"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 31.75"h] 18" Diameter customize cuts and flares as

customize cuts and flares as needed

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 6" OR 6" x 22" duct opening (measured at the opening)

actual front end outer dimensions are approximately 32 5/8" width X 20 5/8" height

+ Product Details Size - 36"w X 8"h is the size for the duct opening measurement only

For 8" duct opening

12"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 31.75"h] 18" Diameter customize cuts and flares as+ Product Details Size 12"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 13. 75" Width X 31. 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