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Air contracts underground, then heats up as it rises through the house. Both of these pull air through the system. Having the upper window downstream helps improve efficiency, but it could also use a simple flue design.
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[–] QualityShitposter 2 points 5 points 7 points (+7|-2) ago
Suction, just like your sister's ass.
Air contracts underground, then heats up as it rises through the house. Both of these pull air through the system. Having the upper window downstream helps improve efficiency, but it could also use a simple flue design.