18"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 29.75"h] Color_Aluminum + Product Details Size –

+ Product Details Size – 14"w X 25"h is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 22 5/8" width X 22 5/8" height

Actual Filter Size – 21 3/4"w x 5 3/4" x 1"

actual front end outer dimensions are approximately 36 5/8" width X 18 5/8" height

18"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 29.75"h] Color_Aluminum + Product Details Size –+ Product Details Size 18"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 29. 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