• Ducts become clogged and contaminated with excessive amounts of dust, pollen or other debris. If moisture is present, the potential for mold and bacteria growth is increased. Spores from such growth may be released into the home’s living space. Some of these contaminants may cause allergic reactions, asthma and/or any other respiratory illness. At Roma Heating Ltd, we have established an special Interaction Cleaning System that cleans all sides of the duct system removing dirt, dust and debris to improve the quality of your indoor air.