12" [Duct Opening] Round Ceiling Diffuser - Easy Air Flow - HVAC Vent Duct Cover [Black] - [Total Outer Dimensions: 16"] w20h20 actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 16 5/8" width X 30 5/8" height

actual front end outer dimensions are approximately 24 5/8" width X 10 5/8" height

+ Product Details Size – 40"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 36"w X 14"h is the size for the duct opening measurement only

1/4" - 6518 PSI

12" [Duct Opening] Round Ceiling Diffuser Easy Air Flow HVAC Vent Duct Cover [Black] [Total Outer Dimensions: 16"] w20h20 actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 16 5 8" width X 30 5 8" height actual front end outer dimensions are approximately 24 5 8" width X 10 5 8" height