Filtrete MPR 2800 16 x 20 x 1 Ultrafine Particle Reduction AC Furnace Air Filter, Captures Fine Inhalable Particles like Bacteria & Viruses, 2-Pack Filtrete Ultrafine Particle Reduction Filter, MPR 2800, 16 x 20 x 1-Inches, 2-Pack Designed with Filtrete Brand 3-in-1 technology from 3M to pull in and trap unwanted air particles while letting clean air flow through Captures micro-particles including: PM 2.5 air pollution, exhaust, soot, smoke, cough/sneeze debris, bacteria, viruses, and lint, dust, and pollen 7 times better compared to non-electrostatic pleated filters for the capture of 0.3 to 1.0 micron particles. Lasts up to 3 months Microparticle Performance Rating MPR 2800 equates to Minimum Efficiency Reporting Value MERV 14