We trade under the name of Gippsland Duct Clean .We have been doing Duct cleaning for since 1997 , most of the homes are now fitted with ducted heating and they do need attention every so often. We recommend ceiling ducts get cleaned every 6-7 years and floor ducted systems get cleaned every 4-5 years. The cleaning process uses its own unique set of equipment , in fact we are amongst the very few duct cleaners that utilize 6 inch flexible duct in our cleaning process. By using 6 inch/150 mm duct we get huge air flow through the duct so we get a better/cleaner result. Most other duct cleaners use 2 inch/50mm duct which when joined to your 6 inch duct produces little air flow.