We engaged John to clean our central heating ducts of which we have 8 in total. He was professional and thorough. He has a special brush which allowed him to clean the entire duct system and when the heater was turned on it emitted a lovely tea tree smell. I tend to suffer from dustmites/hayfever, but this was not a problem. John advised that the ducts only need cleaning every few years. When his prices are compared to other duct cleaning services his is far better value as you know the entire duct system is clean and it only needs to be done every few years. Don't get anyone else to clean your ducts. I know I'll have John clean my ducts when the time comes, Thanks John.