10"x 10" (Duct Opening Size) 4-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 11.75" X 11.75" actual outside dimension is 14

actual outside dimension is 14

To make sure you get the right size

Removable faceplate allows easy cleaning

Outside overall dimension is 15

The Listed size 12"x8" is for inside duct opening measurement

10"x 10" (Duct Opening Size) 4-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 11.75" X 11.75" actual outside dimension is 14The Listed size 10"x 10"is for inside duct opening measurement, actual outside dimension is 11. 75" X 11. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow Four 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