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[Maxnchej]

This is my first year and my bl 2840 chimney top is very black coming down 3 plus inches to the point that the sticker that is on the pipe is really black. Is this normal? I didn't expect to see it so black, I'll get a picture tomorrow and will try and post.

[Jwood]

Exactly what mine looks like

[Uponthehill]

Ditto.  There seems to be more of a downdraft happening on mine than I ever thought. Mine is ~ 5 to 6" down on the pipe. I have 2 three foot sections hooked together. Nonetheless, black on the end but I think would be normal appearance for a pipe exposed to smoke.

[Maxnchej]

Good to know, I only have one pipe on my unit but plan to add another section for next year to get the smoke up higher.

[mootsko]

I have only one length of pipe only,about an inch is black. Got the aquastat set at 190 with a 12 degree cycle.

[Jwood]

It's gonna get dirty when its windy you'll see that smoke circling around the pipe it just cannot be helped I don't believe

[oaky]

It's gonna get dirty when its windy you'll see that smoke circling around the pipe it just cannot be helped I don't believe

You are right about that. My other owb did the same thing with black down a few inches of the pipe. I had two pipe lengths with that one & the same with this one.

The summer rains gets the pipes fairly clean again.

[FareNorth]

For what it's worth, same with my BL2840.  No occasional chimney fires like my buddies boiler.