24"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 25.75"w x 37.75"h] Compatible With Duct 6in this guard is designed to

this guard is designed to provide maximum protection against tampering while maintaining a clean and professional appearance

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 26 5/8" height

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

24"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 25.75"w x 37.75"h] Compatible With Duct 6in this guard is designed to+ Product Details Size 24"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 75" Width X 37. 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