High-Efficiency Particulate Air Filters or HEPA filters provide the best filtration for your home. Hospitals and labs use HEPA filters for their ability to pull 99.97% of particles that are 0.3 micrometers in size. Some system also remove VOCs (Volatile Organic Compounds) and have activated carbon filters. The combination of all three can ease the suffering of even the worst allergy cases. If you don't have a system but are interested in potentially buying one please feel free to give us a call or email or check out our systems. Goodman HEPA Systems