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] 6" Diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 20"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 8"h is the size for the duct opening measurement only

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+ Product Details Size - 25"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 24"h is the size for the duct opening measurement only

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] 6" Diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 20"w X 30"h is the size for the duct opening measurement only + Product Details Size – 22"w X 8"h is the size for the duct opening measurement only