I got a Regency i2400 insert in March and had a few good months with it and now I have a few questions. 1) If you don't see smoke coming out of your chimney can you assume that there isn't much creosote being built up? This is of course assuming that you have a fire going! 2) When I had my chimney swept in the summer (no chance I would do it, the roof is steep and the sweep had to remove a 24x24 concrete stepping stone to put his brushes down) he noticed that the stainless steel top that covered the liner wasn't really doing anything (because the big concrete cap protects the opening) so he removed it. Could this have helped my draft because it seems much better this year? The chimney is about a 25' interior chimney that is lined with a ss flex liner. Any thoughts would be great! And thanks for the help with all my other questions over the past few months! Hilly.