12"W X 10"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.75"W X 11.75"H] 14" Diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 10" x 30" or 30" x 10" is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 27 5/8" width X 22 5/8" height

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Constructed from high-impact

12"W X 10"H [Duct Opening] 3 Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.75"W X 11.75"H] 14" Diameter + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 10" x 30" or 30" x 10" is the size for the duct opening measurement only + Product Details Size 18"w X 8"h is the size for the duct opening measurement only