RV and Home White Stamped Steel Floor Diffuser/Register with Damper 12" X 4" (Duct Opening Size) Outside Dimension 13.5"x 5.5" allowing you to effortlessly adjust

allowing you to effortlessly adjust the intensity of air entering the room

Listed size of 8" is for the duct opening measurement

Individually shrink wrapped and packed with card board box for extra protection

If your duct opening size is 12” x 4”

The Listed size 14"x10" is for inside duct opening measurement

RV and Home White Stamped Steel Floor Diffuser/Register with Damper 12" X 4" (Duct Opening Size) Outside Dimension 13.5"x 5.5" allowing you to effortlessly adjustThe Listed size 12"x 4" is for inside duct opening measurement, actual outside dimension is 13. 5"x 5. 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