18"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 11.75"h] Color_Black Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 21 3/4" x 1"

actual front end outer dimensions are approximately 11

+ Product Details Size – 28"w X 8"h is the size for the duct opening measurement only

+ Product Details Size - 20"w X 26"h X 2"d (for duct opening measurement only)

+ Product Details Outer dimensions: 19

18"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 11.75"h] Color_Black Actual Filter Size – 13+ Product Details Size 18"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 11. 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