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 - RGADJ-3012 7" Round Duct Pipe Quality Packaging carefully packaged

+ Product Details Size - 18"w X 18"h X 2"d (for duct opening measurement only)

+ Product Details Size – 8"w X 18"h is the size for the duct opening measurement only

and installation is quick and simple with the included screws

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

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 RGADJ 3012 7" Round Duct Pipe Quality Packaging carefully packaged + Product Details Size 18"w X 18"h X 2"d (for duct opening measurement only) + Product Details Size – 8"w X 18"h is the size for the duct opening measurement only