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In northern climates your HVAC system may run for several hundred hours each year, drawing enormous volumes of air through your ductwork distribution system in the process. If this air were fresh there would be little cause for concern. But indoor air is far from pristine. In most homes, the air is heavily contaminated with dirt, dust, pet dander, pollen, mold spores, chemical traces from cleaning products, smoke from tobacco products, fumes from adjacent garages, factories or farms . . . the list of potential pollutants goes on and on. Theoretically, the air filters behind your intake registers should help remove these pollutants before they enter your HVAC system. But air filters won’t capture everything, especially if you’ve chosen to install cheap models that catch only the largest particles. As your heating and cooling system circulates the filthy air throughout your home, some of the pollutants it carries will inevitably be deposited inside your air ducts. Over time this particulate matter will build