8"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 9.75"h] with filter For 8" Round Duct Opening

For 8" Round Duct Opening - Spiral or Flex

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

+ Product Details Size – 28"w X 24"h is the size for the duct opening measurement only

Both lines taped together every 18in for easier handling & installation

75" width X 9

8"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 9.75"h] with filter For 8" Round Duct Opening+ Product Details Size 8"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 9. 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