The Accumulair Carbon filter is specifically designed for the purpose of removing and reducing common household odors. Odors are extremely tiny gas particles that accumulate in houses with poor air ventilation. The Accumulair Carbon filter uses carbon filtration to absorb odors and to reduce airborne allergens like dust particles and pet dander. This filter is great for creating a fresher-smelling indoor environment free of unpleasant odors. It removes common household odors like cooking odors, tobacco odors, and pet odors. The Accumulair Carbon filter utilizes its special construction and filtration media to trap odors, gaseous vapors, and allergens like dust particles. The Accumulair Carbon filters can be used anywhere-for the household, office, restaurant, or school, etc. They can be installed in any existing filter system and are great for both residential and commercial use. Features Carbon impregnated disposable pleated panel filters. Each filter lasts up to 3 months. A simple solution for controlling both odors and dust particles! Ideal applications include odors from cooking, new paint, new carpet, bathroom smells, cigarette smoke odor, pet odors. Can be installed in virtually any HVAC system without modifications. Pack 4