6"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 7.75"w x 7.75"h] Color_Anodized Aluminum + Product Details Size -

+ Product Details Size - 4"w X 26"h is the size for the duct opening measurement only

this floor register seamlessly combines durability and design

angle them down for effective warmth distribution

actual front end outer dimensions are approximately 27 5/8" width X 38 5/8" height

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 10" duct openings

6"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 7.75"w x 7.75"h] Color_Anodized Aluminum + Product Details Size -+ Product Details Size 6"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 7. 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 wear