28"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 11.75"h] Compatible with Duct 6" Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 29 3/4" x 1"

actual front end outer dimensions are 9

+ Product Details Size – 26"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 12 5/8" height

28"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 11.75"h] Compatible with Duct 6" Actual Filter Size – 21+ Product Details Size 28"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 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