10"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 11.75"w x 11.75"h] flat stamped steel + How To Measure A

+ How To Measure A Grille Measure the size of the vent opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 8" OR 8" X 18" duct opening (measured at the opening)

actual front end outer dimensions are approximately 26 5/8" width X 32 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 30" OR 30" x 32" duct opening (measured at the opening)

Actual Filter Size – 27 3/4"w x 33 3/4" x 1"

10"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 11.75"w x 11.75"h] flat stamped steel + How To Measure A+ Product Details Size 10"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 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