12"x 4" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 5.75" The listed size 8"w X

The listed size 8"w X 8"h is for duct opening measurement only

Plastic sidewall/ceiling register is made of ABS plastic in bright white

It has built-in damper to control air flow

15" long heavy duty steel construction with matte black powder coating finish

If your duct opening size is 12” x 6”

12"x 4" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 5.75" The listed size 8"w XThe Listed size 12"x 4" is for inside duct opening measurement, actual outside dimension is 13. 75" X 5. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow Three Way Air Flow deflection Design Multi shutter damper with easy handle to adjust desired amount of air flow Individually shrink wrapped with card board pad in the back for extra protection