Air Treatment is the processing of air to impart to it qualities that meet technological or sanitary-hygienic requirements. Air treatment is widely utilized in hot-air heating, ventilation, and air-conditioning systems for industrial and public buildings as well as apartment houses, farm buildings and many others. When condensation occurs in an HVAC system, the YORK Affinity Series Ultraviolet Air Treatment System actively destroys microbial and virus growth. Mold, fungus, and potentially harmful bacteria can all have an impact on the odor of your home, as well as the quality of your indoor air.