14"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 15.75"w x 15.75"h] 18in diameter Actual Filter Size – 7

Actual Filter Size – 7 3/4"w x 31 3/4" x 1"

Actual Filter Size – 27 3/4"w x 33 3/4" x 1"

4" X 14" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Product Details Size – 24"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 20"w X 14"h is the size for the duct opening measurement only

14"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 15.75"w x 15.75"h] 18in diameter Actual Filter Size – 7+ Product Details Size 14"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 15. 75" Width X 15. 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