"Air ducts and ventilation systems naturally accumulate sizable deposits of fine dust particles and other contaminants over a period of years or even months.
These deposits, combined with the temperate, moist atmosphere within ventilation systems, often yielding mold growth and bacteria colonies."
'How serious is the problem? Serious enough to have captured the attention of the U.S. Environmental Protection Agency (EPA), which has recently established "IAQ INFO," a clearinghouse for consumer information.
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