8"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 29.75"h] 10" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 27

actual front end outer dimensions are approximately 21

Actual Filter Size – 23 3/4"w x 19 3/4" x 1"

+ Product Details Size – 32"w X 24"h is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 13 3/4" x 1"

8"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 29.75"h] 10" Round Duct Pipe actual front end outer dimensions+ Product Details Size 8"w X 28"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear