Coils are found in refrigeration equipment including those used in supermarkets and restaurants. It is not uncommon to find hundreds of “through-the-wall” fan coil units in a hotel, dormitory or apartment building. As the air moving over the coils contains dust, dirt, pollen, moisture and other contaminants, the coils get dirty and become less efficient. In addition, the evaporator coil and its condensate pan can become fouled with pollen, mold spores and other biocontaminants that can have adverse effects on indoor air quality. If not maintained, the moisture around the evaporator coil can become a breeding ground for bacteria and mold.