Since 1974 E. L. Foust Co., Inc. has manufactured air purifiers designed for people with multiple chemical sensitivities (MCS),environmental illness, allergies and asthma for use in home, office, school even in automobiles & RVs. The company's air purifiers (including auto air purifier) utilize proven technology such as large beds of activated carbon, state of the art HEPA filters, and optional UV lights to remove dusts, mold, pollens, allergens, viruses, bacteria and chemicals from the air you breathe. E. L. Foust Co., Inc.  can supply HEPA filters for clean rooms for processing vitamins and supplements.