The VentSense line of A/C vent filters is unique in that the filters are the only ones that you simply slide into place without removal of the vent itself. The easy installation and replacement is only one of the patented features that make VentSense an inside air freshener industry leader. VentSense is also the only A/C filter/freshener that incorporates metals that have been proven to have antibacterial, antiviral, and antimicrobial properties. Make sure you freshen the inside air in your home and office with VentSense air filters and fresheners.