Air Duct Cleaning in Greenville/Spartanburg KNOW THE FACTS FACT: Indoor air has been found to be 70 times more polluted than outdoor air. (US Environmental Protection Agency / EPA). FACT: At least 80% of HVAC equipment breakdown is related to dust, dirt and contaminants within the air duct system. FACT: A buildup of 0.052 inches of dirt on a heating or cooling coil results in a 21% loss of efficiency. (EPA) FACT: 50% of all illnesses are either caused by or aggravated by polluted indoor air. (Amer. College of Allergists) FACT: More than 50 million Americans suffer from allergies. FACT: One out of six people who suffer from allergies do so because of the direct relationship to fungi and bacteria in the air duct system. (Total Health and Better Health Magazines) FACT: Most commercially available fiberglass furnace filters are less than 7% efficient. (ASHRAE)