BATHROOM VENTILATION
Do you mean the main stack? If so, you don’t want that – that’s full of sewer gas (which the p-traps on all the plumbing fixtures keep out). Also, if you’re connecting more than one fan to the same duct/vent line, I would think turning one on would actually potentially push air back into the other(s). If you mean a chimney flue, like Randolph said, be careful that you’re not using the same one that vents the boiler or HWH – you’d get CO coming back in that way. Also, I’m just hypothesizing, but if a bathroom vent is meant to remove steam, that would mean a lot of moisture in the flue which could be bad, unless you’re lining it with metal ductwork.
Is there an airshaft or light well? That’s how I ran mine to the roof – up along the inside of the light well.

smadargolan
in General Discussion 7 years and 4 months ago
3
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briskey | 7 years and 4 months ago
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Looking for advise on how best to retrofit ceiling ventilation fan in the bathrooms of a 4 unit brownstone. Can the vent connect to pre-existing vents that go to the roof or will it require removal of bricks to the outside wall?

randolph | 7 years and 4 months ago
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you certainly do not want to tap into a boiler or hot water heater or furnace vent.

eileengray | 7 years and 4 months ago
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If you are going to an outside wall, check the code restrictions that prohibit bathroom exhaust openings near windows. In most brownstones it is hard to get a legal vent on an outside wall.