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Dirty duct systems are a major source of indoor air pollution. Airborne contaminants are pulled into the ducts every time the heating and cooling system runs. Over time, these contaminants build up inside the ductwork, creating an ideal breeding ground for mold, bacteria, fungi and other microbes. Particles drawn into the air ducts also pass through fiberglass filters and infiltrate into HVAC equipment, undermining the performance and energy efficiency of these systems.

