well after 2 full years of use on the system I figure I need to clean the chimney pipe before this season (6" duravent duratech). I went up there today , removed the cap and it didn't look too bad to me (mostly flakey stuff). cleaned the cap ran the brush up and down for a while and it took it right off with a pass or 2. all I had from the pipe down in the stove was about 1-2 cup fill's if that .
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