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All of these contaminants may present a problem. If there is a suspected problem that needs investigating it is worth calling in an expert to make a report and test for the more common problem contaminants we have mentioned and test for any other suspected ones. The HVAC plant itself can be a source of contamination if it is not well maintained. It needs to have the correct design and application of filters to clean the air with regular inspection and cleaning of the duct system on the intake and supply side. The air handling units also need cleaning with attention given especially to the coils and heat exchangers.