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Over time, impurities such as dust, pollen, debris and sometimes harmful pathogens
such as mold, begin to accumulate on air duct surfaces. If the air has a high moisture
content, fungi and bacteria may also begin to grow. Some of these particles can
contain harmful pathogens, which when inhaled, can cause respiratory problems. Ridding
the ducts of these pathogens on a regular basis is important as severe health problems
can occur if these organisms are allowed to build up.
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