26"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 15.75"h] 14" Round Duct Pipe 875" width X 15

875" width X 15

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening)

The total outer size of this grille is the listed size plus 2

actual front end outer dimensions are approximately 41

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

26"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 15.75"h] 14" Round Duct Pipe 875" width X 15+ Product Details Size 26"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 15. 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