6"W X 6"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 7.75"W X 7.75"H] 10in diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 13

Metal Fab - A brand you can trust

+ Product Details Size - 22"w X 28"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 30" OR 30" x 20" duct opening (measured at the opening)

Installs Directly On Round & Oval Spiral Duct - No Frames

6"W X 6"H [Duct Opening] 4 Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 7.75"W X 7.75"H] 10in diameter actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 13 Metal Fab A brand you can trust