8"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 9.75"w x 9.75"h] 6" Round Duct Pipe Actual Filter Size – 25

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

Actual Filter Size – 31 3/4"w x 31 3/4" x 1"

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High Quality – high quality solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

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

8"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 9.75"w x 9.75"h] 6" Round Duct Pipe Actual Filter Size – 25+ 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