26"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 11.75"h] 14in diameter if your hole is 20"

if your hole is 20" wide by 14" tall

and sound level range of NC 25 to 35

of up to 300m3/h

+ Product Details Size – 15" Corner Baseboard Grille - White - HVAC corner vent cover

with actual outer dimensions of 18

26"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 27.75"w x 11.75"h] 14in diameter if your hole is 20"+ Product Details Size 26"w X 10"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 27. 75" Width X 11. 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