18"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 13.75"h] 8" Round Duct Pipe + Product Details Size -

+ Product Details Size - 8"w X 22"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 27 3/4" x 1"

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

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18"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 13.75"h] 8" Round Duct Pipe + Product Details Size -+ Product Details Size 18"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 13. 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