36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 37.75"w x 37.75"h] 10" Round Duct Pipe so you are not left

so you are not left with much waste

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

Achieve the perfect airflow with adjustable control by rotating the middle disk

+ Product Details Size – 12" X 2" is the size for the duct opening (floor/vent hole) measurement only

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36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 37.75"w x 37.75"h] 10" Round Duct Pipe so you are not left+ Product Details Size 36"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 37. 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