Filtrete MPR 2200 20 x 30 x 1 Healthy Living Elite Allergen Reduction HVAC Air Filter, 2-Pack Featuring high performing electrostatic technology, Filtrete Healthy Living filters proactively attract and capture microscopic particles, including: PM 2.5 air pollution, exhaust particles, candle soot and smoke, cough and sneeze debris, bacteria and viruses along with large particles like lint, dust and pollen from air passing through the filter Designed with Filtrete Brand 3-in-1 technology from 3M to pull in and trap unwanted air particles while letting clean air flow through 5 times better small particle capture compared to non-electrostatic pleated filters for the capture of 0.3 to 1.0 micron particles. Outperforms fiberglass, washable and non-electrostatic pleated 1" filters Microparticle Performance Rating MPR 2200 equates to Minimum Efficiency Reporting Value MERV 13