Many people are becoming aware of the problems of indoor air pollution. Today’s houses are more airtight and contain more synthetic materials in furnishings, carpets and building materials that can cause unhealthy indoor air. Lots of companies are marketing products and services intended to improve our indoor air quality. One business sector is duct cleaning. Duct cleaning refers to the cleaning of heating and cooling components of forced air systems. This includes the supply and return air ducts and registers, grills and diffusers, heat exchangers and heating and cooling coils, condensate drains (drippans), fan motor and housing and the air handling unit housing. When Should Ducts be Cleaned? Water in ducts. If you have the presence of any water in your ducts, mold growth may become a health issue. The first thing to do is solve the water problem by determining how it is getting into the system, and fixing that problem. Clean and disinfect the affected area and then clean the rest of the system. Construction. If you are moving into a new home, or have recently remodeled. Often sawdust, drywall dust and other construction debris (lunch bags, pop cans) makes its way into the ducting and should be removed before operating the system. Furnace air flow issues. If you are having furnace airflow problems. There could be significant blockages in the system that when removed could increase airflow. Cleaning debris out is much less expensive than re-routing ducts to try to increase flow. Visual inspection. If you can visually see debris or accumulated dust buildup in the ducts. Having small children who delight in hiding little toys and other treasures down a register, or having pets that shed hair regularly, can both contribute to this problem.