There are two important elements to the duct cleaning process. First, a powerful negative air machine, located outside of your house, is connected to the duct system to extract contaminants from ductwork. Second, by combining brushing with high pressure, air is used to dislodge and agitate any of the common contaminants.
Beware of competitors that use commercial floor vacuum cleaners, as these only partially clean the duct systems. Floor vacuum cleaners are not appropriate for cleaning duct systems alone. This task requires the use of a lot of specialist equipment to provide a thorough cleaning. Airfix's duct cleaning equipment has been uniquely designed and tested to ensure that it is most suitable for Australian systems.