12"x 6" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 7.75" The Listed size 8"x 8"

The Listed size 8"x 8" is for inside duct opening measurement

actual outside dimension is 21

The listed size 14" x 6" is for the inside duct opening measurement

75” wide by 9

12"x 6" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 7.75" The Listed size 8"x 8"The Listed size 12"x 6" is for inside duct opening measurement, actual outside dimension is 13. 75" X 7. 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