10" X 10" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] w26h26 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 30"w X 32"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 34 5/8" height

line-height: 20px

75" Height

actual front end outer dimensions are approximately 21 5/8" width X 33 5/8" height

10" X 10" [Duct Opening] 1 Way Air Vent Adjustable Aluminum Curved Blades Integral Multi Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] w26h26 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 30"w X 32"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 12 5 8" width X 34 5 8" height