The Environmental Protection Agency (EPA) reckons that 10 million school days are lost because of asthma each year. Many respiratory problems are caused or aggravated by air-borne contaminants, such as those arising from mold and mildew, the EPA says.

To reduce the health risks to students, teachers, and other school personnel, some schools are now using germicidal ultraviolet light to irradiate the cooling coils located within their heating, ventilation, and air conditioning (HVAC) systems.

When heating and cooling systems cycle on and off, condensation occurs in the HVAC units, and they become the


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