14"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 13.75"h] Adjustable Return Actual Filter Size – 31

Actual Filter Size – 31 3/4"w x 21 3/4" x 1"

See our separate listing for T-Bar supply grille

+ Product Details Size – 22"w X 25"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 18"w X 8"h is the size for the duct opening measurement only

14"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 13.75"h] Adjustable Return Actual Filter Size – 31+ Product Details Size 14"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 75" Width X 13. 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