36"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 25.75"h] w28h28 Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 11 3/4" x 1"

+ Product Details Size - 36"w X 20"h is the size for the duct opening measurement only

Designed with durable

actual front end outer dimensions are approximately 20 5/8" width X 26 5/8" height

36"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 25.75"h] w28h28 Actual Filter Size – 21+ Product Details Size 36"w X 24"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 25. 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