6"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 7.75"w x 7.75"h] w34h34 + Product Details Size -

+ Product Details Size - 28"w X 12"h is the size for the duct opening measurement only

7/8" - 3397 PSI

actual front end outer dimensions are approximately 22 5/8" width X 26 5/8" height

+ Product Details Size – 22" x 36" or 36" x 22" is the size for the duct opening measurement only

The smooth

6"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 7.75"w x 7.75"h] w34h34 + 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