3M 2200 Series Filtrete, 4-Pack, Various Sizes. Lasts up to 3 Months. For residential Use Only. Premium Allergen & Home Pollutants. Reduces Airborne Dust, Allergens, Bacteria & Viruses. Tough on Unwanted Particles. Easy on Airflow. Healthy Living Elite Allergen Reduction HVAC Air Filter. Help Get a Cleaner, Fresher Home. Delivers Cleaner Air Throughout Your Home. Each Filter Is Separately Sealed in Plastic. 4 Filters Are in One Cardboard Box. Keeping your home clean and healthy is your mission and Filtrete Healthy Living filters can be your perfect partner. Featuring high performing electrostatic technology, Filtrete filters proactively capture dust, bacteria, germs, viruses and allergens in your air. For optimum performance, change your filter every 90 days or sooner. The Filtrete Elite Allergen Reduction filter outperforms all 1" filters. It attracts and captures microscopic particles like bacteria and particles that can carry viruses and large particles like mold spores and pollen. *Electrostatic filters are most effective when clean and new.