This metal damper slides into place along the built-in grooves on our Flush and Self Rimming floor vents within seconds! It allows you to easily and quickly adjust airflow by moving the almost invisible handle in the last louver opening. No need to remove the vent from the floor, just simply slide it back and forth to open and close the air flow. It can easily be removed or installed on the vent just by bending back the tabs on either end. Our shop can provide all sizes, all specifics vents for you.