Honeywell media air cleaners feature two grades of fine particle filters; True HEPA filters that are 99.97% efficient at trapping .3 micron size particles and hospital-grade DOP filters that are 95% efficient at trapping .3 micron size particles. For odor control, Honeywell's media air cleaners utilize CPZ sorbent media modules that are specially formulated for maximum efficiency at reducing gases, odors and volatile organic compounds (VOCs).