12"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 19.75"h] w18h18 2 recessed screw holes on

2 recessed screw holes on each side with screws included

actual front end outer dimensions are approximately 30 5/8" width X 36 5/8" height

+ Product Details Size - The listed 5" diameter refers specifically to the size of the duct opening

actual front end outer dimensions are approximately 12 5/8" width X 38 5/8" height

+ Product Details Size – 30"w X 34"h is the size for the duct opening measurement only

12"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 19.75"h] w18h18 2 recessed screw holes on+ Product Details Size 12"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 13. 75" Width X 19. 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