16"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 37.75"h] Return Grille + Product Details Size –

+ Product Details Size – 12" x 28" or 28" x 12" is the size for the duct opening measurement only

+ Product Details Size - 22"w X 12"h X 2"d (for duct opening measurement only)

Just run your finger along the edge of the top plate and you will find a smooth finished surface

+ Product Details Size – 10" x 16" or 16" x 10" is the size for the duct opening measurement only

+ Product Details Size – 18"w X 28"h is the size for the duct opening measurement only

16"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 37.75"h] Return Grille + Product Details Size –+ Product Details Size 16"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 75" Width X 37. 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