12"W X 12"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.75"W X 13.75"H] Powder Coated The ring base allows installation

The ring base allows installation without removing the thermostat

+ Product Details Size – 26"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 20"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 10" round duct opening-

and matte black

12"W X 12"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.75"W X 13.75"H] Powder Coated The ring base allows installation+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are 13. 75" width X 13. 75" height. Design Individually adjusting curved blades for better air flow control. 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 luxurious touch to any home.