Some of the benefits of air duct cleaning are that system cleaning will allow systems to run more efficiently by removing debris from sensitive mechanical components. Clean, efficient systems are less likely to breakdown. They have a longer life span, and generally operate more efficiently than dirty systems. Duct cleaning can also reduce the amount of allergens in the duct system. These allergens can be circulated throughout the home with your forced air system. How a forced air system works is that air is drawn into the system through your return grills and fed into the system through your return ductwork. The air from the return side of the ductwork is fed into the lower compartment of the furnace; where the blower is located. The air passes through the filter and then is pushed up with the help of the blower. The air then passes through the upper part of the furnace where it can be heated or cooled depending on if the heat or air conditioning is on. The air then flows through th...