8" X 8" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 9.75"W X 9.75"H] RG66 Black-HP actual front end outer dimensions

actual front end outer dimensions are approximately 12 5/8" width X 24 5/8" height

then you'll need a 14-inch round vent

actual front end outer dimensions are approximately 27 5/8" width X 30 5/8" height

Multi Angled Fan Pattern Fins For Multi Directional AIr Distribution Throughout The Entire Room

actual front end outer dimensions are approximately 38 5/8" width X 16 5/8" height -

8" X 8" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 9.75"W X 9.75"H] RG66 Black-HP actual front end outer dimensions+ Product Details Size 8"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are 9. 75" width X 9. 75" height. Design Individually adjusting curved blades. Multi shutter damper with handle operator to adjust air flow. Screws Included High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant, beautiful, and smooth surface, adds a