16"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 17.75"w x 9.75"h] 8in diameter + Product Details Size -

+ Product Details Size - 16"w X 14"h is the size for the duct opening measurement only

Measure the size of the air duct/drywall opening

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+ Product Details Size – 36"w X 22"h is the size for the duct opening measurement only

Actual Filter Size – 17 3/4"w x 5 3/4" x 1"

16"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 17.75"w x 9.75"h] 8in diameter + Product Details Size -+ Product Details Size 16"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 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