26"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 17.75"h] Compatible With Duct 12in + Product Details Size –

+ Product Details Size – 16" x 30" or 30" x 16" is the size for the duct opening measurement only

Rigid gauge built for durability and long life in mind

actual front end outer dimensions are 13

+ Product Details Size - 12"w X 14"h X 2"d (for duct opening measurement only)

26"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 17.75"h] Compatible With Duct 12in + Product Details Size –+ Product Details Size 26"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 17. 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