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Upside down flue pipe?

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. . . On the other hand, imbrication of furnaces and water heaters is in the opposite direction.

Not really. In a B-vent, the upper liner sleeves inside the lower, just like on a woodstove. If you're using single-wall vent pipe, you should be sleeving it the same way, but few do. The result is condensation that runs outside the joints.

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