RV and Home Brown Stamped Steel Floor Diffuser/Register with Damper 8" X 4" (Duct Opening Size) Outside Dimension 9.6"x 5.6" Width vs Height The first

Width vs Height The first measurement in a return grille size is the width(horizontal measurement)

If your duct opening size is 10” x 6”

Duct opening – a hole that holds the duct neck to allow air to come out from HVAC system

Compliant with ANSI Z21

RV and Home Brown Stamped Steel Floor Diffuser/Register with Damper 8" X 4" (Duct Opening Size) Outside Dimension 9.6"x 5.6" Width vs Height The firstThe Listed size 8"x 4" is for inside duct opening measurement, actual outside dimension is 9. 6"x 5. 6" 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