20"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 35.75"h] w24h24 Actual Filter Size – 19

Actual Filter Size – 19 3/4"w x 21 3/4" x 1"

The crank handle lever makes it easy to adjust to every weather situation

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 32" OR 32" x 28" duct opening (measured at the opening)

+ Product Details Size - 40"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 8"h X 2"d (for duct opening measurement only)

20"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 35.75"h] w24h24 Actual Filter Size – 19+ Product Details Size 20"w X 34"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 35. 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