12"x 8" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 9.75" All plastic construction with 1/2"

All plastic construction with 1/2" fin spacing for high air flow with rust proof feature perfect for areas with high moisture

and long-term durability

Individually packed with card board box for ultra protection

Easy adjust air flow control with central lever

The Listed size 12"x 4" is for inside duct opening measurement

12"x 8" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 9.75" All plastic construction with 1/2"The Listed size 12"x 8" is for inside duct opening measurement (the duct hole) , actual outside dimension is 13. 75" X 9. 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