Hi, I noticed a lot of black fines that seem to be accumulating all over the place, on and around the gear box of my worm ... but more so .. about 1.5 inches settling into the ledge of the round door (the veiwer or whatever you call it). I open the round door to look at the fire ... and I noticed a lot of fines accumulating there. My concern, are these going to eventually get to the smoke pipe coming out? I used to have a stoker that got clogged with fly ash after a short period of use .... I noticed the draft seemed a bit weaker than when we first got it running ... after only 2.5 ton of coal ... burning buck ... anthracite .. but it's from Trevorton .. told it is not as hard as some other coal. Anyway, I heat an apartment building with it ... 5 units ... I can't exactly shut it down in the middle of winter ... but is that something I should plan on doing halfway through the season? ... A mid season clean? .. Or are these excess fines normal? I do have an 11 inch stove pipe ... so it is not small .. but well... I'm at a loss. I love this furnace .. just want to make sure it is maintained properly.