RV and Home Brown Stamped Steel Floor Diffuser/Register with Damper 10" X 3" (Duct Opening Size) Outside Dimension 11.5"x 4.5" Actual outside overall dimensions is

Actual outside overall dimensions is 9

The listed size 12" x 10" is for the inside duct opening measurement

Distance between the centers of two screws is 11"

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

The Listed size 12"x12" is for inside duct opening measurement

RV and Home Brown Stamped Steel Floor Diffuser/Register with Damper 10" X 3" (Duct Opening Size) Outside Dimension 11.5"x 4.5" Actual outside overall dimensions isThe Listed size 10"x 3" is for inside duct opening (the hole) measurement, actual outside dimension is 11. 5"x 4. 5" Butterfly damper with easy foot operated control dial for desired air flow Two sunk screw holes located at both sides of the register for ceiling and wall mounting with included screws Brown powder coating with matte finish Individually shrink wrapped with card board pad in the back for extra protection