36"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 33.75"h] Width_20in + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 20" OR 20" X 14" duct opening (measured at the opening)

Actual Filter Size – 23 3/4"w x 31 3/4" x 1"

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+ Product Details Size – 28" x 28" is the size for the duct opening measurement only

+ Product Details Size - 26"w X 20"h is the size for the duct opening measurement only

36"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 33.75"h] Width_20in + Product Details Perfect Fit+ Product Details Size 36"w X 32"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 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