This damper will allow you to control the air flow through your floor vent by opening or closing the tab on the inside of the unit.  This damper does not fasten to the vent so it is universally used in the duct opening and can be added to any installation. Our in floor damper is easily installed into your HVAC duct opening using four metal screws and an instruction pamphlet provided.   To access your duct work simply remove the screws of the system and re-install when completed.