30"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 13.75"h] 12" Round Duct Pipe Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 9 3/4" x 1"

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

Universal size

+ Product Details Size – 34"w X 22"h is the size for the duct opening measurement only

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

30"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 13.75"h] 12" Round Duct Pipe Actual Filter Size – 23+ Product Details Size 30"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 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