Once or twice yearly, but I make a point of burning a hot fire when I first start it, to reduce creosote build up . I have a burn indicator on the chimney to give me temperatures, so I know what's going on up there. Also mix wood to give me the best combustion.
Grizz
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"Indeed, no human being has yet lived under conditions which, considering the prevailing climates of the past, can be regarded as normal."
John E. Pfeiffer The Emergence of Man
written in 1969
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