10" X 10" [Duct Opening] 4-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] 8" Round Duct Pipe + Product Details Size – actual front end outer LO246 Powder Coated

+ Product Details Size – 10" X 2" is the size for the duct opening (floor/vent hole) measurement only

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+ Product Details Size - 16"w X 8"h is the size for the duct opening measurement only

designed for optimal airflow and efficiency

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

10" X 10" [Duct Opening] 4 Way Air Vent Adjustable Aluminum Curved Blades Integral Multi Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] 8" Round Duct Pipe + Product Details Size – actual front end outer LO246 Powder Coated + Product Details Size – 10" X 2" is the size for the duct opening (floor vent hole) measurement only display = isOpen