30"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 31.75"h] rg1010 accordion-header h3 { margin: 0

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The total outer size of this grille is the listed size plus plus 2 and 5/8"

rust-free aluminum construction with smooth finished edges and counter-sunk screw holes (screws included)

Actual Filter Size – 9 3/4"w x 17 3/4" x 1"

actual front end outer dimensions are 37

30"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 31.75"h] rg1010 accordion-header h3 { margin: 0+ Product Details Size 30"w X 30"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 31. 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