36"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 7.75"h] Compatible With Duct 12in + Product Details Size -

+ Product Details Size - 34"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 8"h Is The Size For The Duct Opening Measurement Only

75"H – fits a 14" X 4" duct opening

Design – Rigid gauge ABS plastic

+ Product Details Size - 28"w X 16"h is the size for the duct opening measurement only

36"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 7.75"h] Compatible With Duct 12in + Product Details Size -+ Product Details Size 36"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 7. 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