Maximum Length of an OAK. Any Suggestions?

It might say it your manual. I think for anything longer than a 12-15' run, the general recommendation is to up the pipe ID from 2" to 3".

WKB said:

I'm thinking about running an OAK with my new stove. The manual indicates the intake needs to be at least 4 feet from the exhaust. The total run may be closer to 10-15 feet. Has anyone run into problems with extended runs on OAK?

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So far no problems here. Due to elevation, 7500 Ft, and pipe length I ended up going with 3in. OAK and 4 in Exhaust in a single pipe using Selkirk Direct Temp. My pipe is approx 17 Ft in length.

Pics of the roof termination. Went up 36 in because of the amount of snow the parapets accumulate.

EastMtn said:

Went up 36 in because of the amount of snow the parapets accumulate.

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If so the class B vent behind is kinda low. no?

smoke show said:

If so the class B vent behind is kinda low. no?

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Water intake?

https://www.hearth.com/talk/threads/55-long-oak-harman-pf100.102627/
No issues since installed. Works like a champ.

WKB said:

What kind of coupling did you use that reduced the 3 inch pipe to the 2 inches on stove? Do you think the extra length increased the smoke fan noise?

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Selkirk direct temp pellet pipe uses the outer jacket of the pipe to draw in fresh air, then it has a special transitional piece near the stove adapter from which you use flex pipe. Anyway to really answer your question most people use exhaust pipe adapters from auto parts stores.

smoke show said:

If so the class B vent behind is kinda low. no?

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The one behind is ventilation for the space between the roof and ceiling. There's another stack not in the picture for zero clearance fireplace. Flat parapet roofs in the mountains may look nice but they are a contradiction to the low maintenance solution.

WKB said:

What kind of coupling did you use that reduced the 3 inch pipe to the 2 inches on stove? Do you think the extra length increased the smoke fan noise?

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Exactly what Smoke Show said. I used 2 auto exhaust pipe adapters to make the transition. The exhaust fan noise hasn't changed that I can tell.