24"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 25.75"w x 25.75"h] 10in diameter Actual Filter Size – 25

Actual Filter Size – 25 3/4"w x 33 3/4" x 1"

Actual Front End Outer Dimensions Are 42" Width X 18" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

Think of the diameter as a straight line from one end to the other

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 18" or 18" x 10" duct opening (measured at the opening)

Vertical blades in the back

24"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 25.75"w x 25.75"h] 10in diameter Actual Filter Size – 25+ Product Details Size 24"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 75" Width X 25. 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