I have a question about a standard open fireplace. ( actually I just wanted to use my new avatar (just kidding)) I have a traditional true rumford fireplace that I have burned for years. I will use it just for ambiance this year now that we have a seperate stove. A friend of mine who works for the local fire dept told me that you never have to clean a flue in a standard open fireplace because there is no way to restrict the air to the fire and therefore it will never produce creosote. After 9 years of burning I cleaned the flue and only got less than a small cup of creosote from the first 18 feet of the chimney. It would seem as thought he is correct. I only burn dry wood that has been seasoned a year or more. What is the concensus on this? Do you really need to clean the masonry flue of an open fireplace?