Tropical bay filter fresh whole home air freshener pad, attaches instantly to any furnace/ac filter, delivers whole home fragrance, eliminates unwanted odors, when your system is running experience a gentle scent that will last for days, contain an odor counteracting working with the fragrance to help eliminate odors, carbonizes dried coconut shells within an enclosed self sustaining system, converting harmful emissions into useful thermal energy, use to scent small areas like closets, bathrooms & even vehicles.