26"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 7.75"h] Aluminum Adjustable Curved Blade you can attain the diameter

you can attain the diameter of the vent

+ Product Details Size – 22" x 28" or 28" x 22" is the size for the duct opening measurement only

this coil exceeds the required 700 PSI for R410 with a pressure rating of 2300 to 6500 PSI

Our grilles feature a durable powder-coat finish

+ Product Details Size - 8"w X 18"h X 2"d (for duct opening measurement only)

26"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 7.75"h] Aluminum Adjustable Curved Blade you can attain the diameter+ Product Details Size 26"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 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