RV and Home White Stamped Steel Floor Diffuser/Register with Damper 12" X 2" (Duct Opening Size) Outside Dimension 13.5"x 3.75" Actual outside dimension is 10"

Actual outside dimension is 10"

Space-Saving: Compact size maximizes usable floor space

The Listed size 8"x18" is for inside duct opening measurement

actual outside dimension is 9

Neck Size 8”

RV and Home White Stamped Steel Floor Diffuser/Register with Damper 12" X 2" (Duct Opening Size) Outside Dimension 13.5"x 3.75" Actual outside dimension is 10"The Listed size 12"x 2" is for inside duct opening measurement, actual outside dimension is 13. 5"x 3. 75" 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. Distance between the two screw holes is 13. 25". White powder coating with matte finish Individually shrink wrapped with card board pad in the back for extra