34"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 27.75"h] 12" Diameter } /* LIST SPACING */

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+ Product Details Size – 10" x 28" or 28" x 10" is the size for the duct opening measurement only

+ Product Details Size - 16"w X 6"h X 2"d (for duct opening measurement only)

+ Product Details Size - 36"w X 36"h X 2"d (for duct opening measurement only)

Perforated steel grille for return air flow

34"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 27.75"h] 12" Diameter } /* LIST SPACING */+ Product Details Size 34"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 35. 75" Width X 27. 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