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While replacing the screen in the exhaust fan in the downstairs bathroom, I noticed that it is vented into a shaft that leads directly to a skylight. The second story vents into the same shaft and there is no ductwork for either. I guess this is bad. I went up to the roof and can’t find any outlet for this ventilation scheme, so I assume all that steam leaving the bathrooms, is being deposited in the walls and celings around this shaft. Was this shaft designed to provide light to these interior rooms which have no windows? Has anyone used them for ventilating bathrooms and how did you direct the exhaust outside?