RV and Home White Stamped Steel Floor Diffuser/Register with Damper 10" X 3" (Duct Opening Size) Outside Dimension 11.5"x 4.5" The Listed size 12"x 12"

The Listed size 12"x 12" is for inside duct opening measurement(duct hole)

buy a 20x14 grille

actual outsize overall dimensions is 9

buy a 14x20 grille

Heavy duty stamped steel face for long lasting use

RV and Home White Stamped Steel Floor Diffuser/Register with Damper 10" X 3" (Duct Opening Size) Outside Dimension 11.5"x 4.5" The Listed size 12"x 12"The Listed size 10"x 3" is for inside duct opening 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 White powder coating with matte finish Individually shrink wrapped with card board pad in the back for extra protection