Top Outlet Ceiling Diffuser Box | 10" X 10" X 8" | Galvanized Steel Metal Box Is Compatible With Duct 8" Insulated Line + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 22"w X 6"h is the size for the duct opening measurement only

+ Product Details Size – 36"w X 18"h is the size for the duct opening measurement only

Dimensions With Outer End are 9

Actual Front End Outer Dimensions Are 12" Width X 6" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

+ How To Measure A Round Vent Overall Size:

Top Outlet Ceiling Diffuser Box 10" X 10" X 8" Galvanized Steel Metal Box Is Compatible With Duct 8" Insulated Line + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 22"w X 6"h is the size for the duct opening measurement only + Product Details Size – 36"w X 18"h is the size for the duct opening measurement only