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Push exhaust below fire tunnel grade?

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I know that, normally, the fire tunnel is at about the same grade level as the exhaust tunnel; but I have a situation where I'm considering building (or buying a zaug) RMH core and riser/barrel that would sit on my main floor (of a single story home) and that the exhaust would be forced down into the basement. After which, the stovepipe would be run horizontally about 25 feet straight (maybe one 90) across the basement hung from the rafters, and then 90 back up through the foor to meet with an existing standard woodstove chimney to exit the house above the highest point in the house. What I want to know is, has anyone attempted to force the exhaust gases downward any significant amount (I'm guessing I'd need to push about 4 feet below the level of the burn tunnel) and how warm should the exhaust gases be in order to draft properly out of a single story home?
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