20"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 17.75"h] w8h8 + Product Details Size -

+ Product Details Size - 6"w X 34"h X 2"d (for duct opening measurement only)

with actual outer dimensions of 22

Easy Unrestricted Air Flow For Your HVAC System

+ Product Details Size – 28"w X 14"h is the size for the duct opening measurement only

+ Product Details Size – 16" x 26" or 26" x 16" is the size for the duct opening measurement only

20"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 17.75"h] w8h8 + Product Details Size -+ Product Details Size 20"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 17. 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