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 measurement is 16"

Actual outside measurement is 16" x 8"

The Listed size 24"x20" is for inside duct opening measurement

Actual outside dimension is 12"

this vent cover can be used for air supply in various residential and commercial settings

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 measurement is 16"The 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