Easily attaches to any size air filter and makes your whole house smell great. Now you can enjoy your favorite, time released fragrance throughout your entire home, apartment or office with FilterMate. FilterMate easily attaches to any size air filter, including electrostatic (unless filter is directly connected to household electrical current) as well as, air conditioning/heat window, units, box, oscillating fans, ext. Changing your air filter frequently helps you maintain the peak performance, efficiency and service life of your equipment. Your FilterMate acts as a handy reminder to check the cleanliness of your air filter on regular basis.