The Honeywell MERV 11 Allergen Reducer 11000 Electrostatic Pleated HVAC AC Furnace Air Filter is a high-performance air filter for home, house and residential use that helps clean your indoor air of large particles and some of the smallest airborne particles as well. This pleated air filter uses an electrostatic filter media that helps improve the filtration performance of the filter. This filter is compatible with almost any brand and is appropriate for use in air conditioners, furnaces, heat pumps and HVAC units. To maintain optimal filtration performance, change your home air filter at least every 90 days. Regularly replacing air filters can potentially prevent costly repairs and help reduce monthly energy use. A dirty air filter restricts air flow and forces your heating and cooling or HVAC system to work harder to keep your home at the desired temperature.