22"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 19.75"h] Aluminum Bar Actual Filter Size – 19

Actual Filter Size – 19 3/4"w x 15 3/4" x 1"

+ Product Details Size - 4"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 18 5/8" height

+ Product Details Size - 22"w X 6"h is the size for the duct opening measurement only

22"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 19.75"h] Aluminum Bar Actual Filter Size – 19+ Product Details Size 22"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 23. 75" Width X 19. 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