Dust Free Ultraviolet Air Purifiers - Bio-Fighter UV-C Products - Germicidal Ultraviolet Light Dirty Socks Syndrome. Sick Building Syndrome. These are some of the names given to mold and bacteria problems in heating and cooling systems. UV-C light is a proven method of reducing these bacteria, viruses, yeasts, and molds. Several medical studies using germicidal ultraviolet air disinfection have proven effective in reducing the spread of tuberculosis, measles, influenza, smallpox, and controlling infection in operating rooms. * 50% of all illnesses are either caused or aggravated by, polluted indoor air. (American College of Allergists) * Levels of air pollution inside the home can be two to five times higher, and occasionally 100 times higher, than outdoor levels. (Environmental Protection Agency) * One out of six people who suffer from allergies do so because of the direct relationship to fungi and bacteria in air duct systems. (Health Magazine) *** Professional Installation Recommended. The Bio-Fighter® UV-C Light System most suitable for your needs should be recommended and installed by a UV-C trained professional. New electrical service may be required at the installation location and this should also be performed by a trained professional. ATTENTION - Do Not Mount Device In Any Location That Allows Ultraviolet Light To Be Seen After Installation.