Routinely cleaning the air ducts in your office will help ensure your employees (and customers) are not breathing in harmful air pollutants. Your heating, ventilating and air conditioning (HVAC) system serves as the lungs of your building, and contaminants and air pollutants such as dust, mold spores and chemicals are pulled into that system and re-circulated five to seven times a day. Over time your building’s indoor air quality will decrease as the system becomes clogged with dirt. This effect is amplified if air filters are not switched out on a regular basis. Learn the signs that indicate you need to get your air ducts clean.