Aluminum Garage Door Air Vent Grille Register - With Damper Control Lever For Winter & Summer Settings - With Insect Net Prevent Guard [Outer Dimensions: 17.5"w X 12"h] d + Product Details Size –

+ Product Details Size – 36"w X 18"h is the size for the duct opening measurement only

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+ Product Details Size - 10"w X 32"h is the size for the duct opening measurement only

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Aluminum Garage Door Air Vent Grille Register - With Damper Control Lever For Winter & Summer Settings - With Insect Net Prevent Guard [Outer Dimensions: 17.5"w X 12"h] d + Product Details Size –Outer Dimensions Are 17. 5" Wide x 12" Tall x 2. 75" Deep Will Fit All Garrage Doors Insulated And Non Insulated Garrage Doors [The Hole In The Door SHould Be: 15 x 9 ] Made of High Quality Aluminum That Will Never Rust Contorl Lever To Adjust Louvers According To Season Complete Open For Summer To Release The Heat, Close For Winter To Prevent The Cold With Insect Net That Will Prevent Mousquitos and Insects From Entering To Maximize Ventilation