Filtretre Basic Dust and Lint 300 MPR Furnace Filter, 20 in. x 20 in. x 1 in. is designed to provide basic filtration for your HVAC system. Unlike ordinary non-electrostatic air filters, this filter features an electrostatically charged design that attracts and traps more particles as air passes through your heating and cooling system. It is specifically made to capture dust and lint, helping to improve the air quality in your home. While it may not be as effective at capturing microscopic particles or allergens as higher MPR filters, it remains a reliable choice for basic filtration needs. Using the Filtrete Basic Dust and Lint Furnace Filter helps keep your indoor air cleaner with every cycle through the filter. Model Number: 302-4