8"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 33.75"h] Adjustable Return Actual Filter Size – 7

Actual Filter Size – 7 3/4"w x 23 3/4" x 1"

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 12" OR 12" x 20" duct opening (measured at the opening)

Actual Filter Size – 33 3/4"w x 19 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 16" duct openings

8"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 33.75"h] Adjustable Return Actual Filter Size – 7+ Product Details Size 8"w X 32"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 75" Width X 33. 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