10"W X 8"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 11.75"W X 9.75"H] 8" Diameter please note that the total

please note that the total outer dimensions of the grille measure 8" in diameter

Installation is simple

Actual Filter Size – 33 3/4"w x 7 3/4" x 1"

+ Product Details Size – 28"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

10"W X 8"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 11.75"W X 9.75"H] 8" Diameter please note that the total+ Product Details Size 10"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are 11. 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