10"x 4" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 11.75" X 5.75" Distance between the centers of

Distance between the centers of two screws is 14

The Listed size 8''X 8'' is for inside duct opening measurement

• Heavy-Duty Steel Construction: Built from high-quality steel with a durable powder-coated finish for long-lasting performance and corrosion resistance

please take off your old floor register and measure the duct hole

10"x 4" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 11.75" X 5.75" Distance between the centers ofThe Listed size 10"x 4" is for inside duct opening measurement, actual outside dimension is 11. 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