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2

You circuit is wired without bringing the neutral wire to the switch box and so only the HOT wire comes to the switch and the switched wire goes back to the fan. For a traditional (i.e. dumb) switch, this works fine. When you try to use a "smart" switch, and your electronic timer switch is such a switch, you have to supply power to the switch itself and ...


1

Oh, you definitely want a bathroom fan even if you have a window. There are two reasons you want to ventilate a bathroom, one is humidity from the shower. The "open window" method is not reliable for removing humidity, and that gets you mold. As for the other reason, half the time air blows in through the window, pushing bathroom air into the rest of the ...


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Absolutely buy an expensive fan, one with good bearings and a big motor. They are far quieter than the cheapies. You won't use a bath fan if the noise is deafening.


3

The code requires an exhaust fan of 80 cfm for bathrooms with a tub, shower or spa. (See ICC M1507.) For bathrooms without a tub, shower or spa a window of 3 square feet (of which half must open) may be provided. (See ICC R303.3)


0

When they were first required by code is one thing, but finding out when people first decided to use a fan to help bathroom ventilation is another - the saying "necessity is the mother of invention" is very apt...


2

I don't know when it became a requirement but building codes came into effect in 1955. If they were installed then it was by choice since no rule existed before then, that I know of. If an old code book can be found particular to you area, then it could be determined. But back in the day, the code was different area by area. Not greatly but small differences ...


1

You're using the word "wire" to describe what is actually "cable". 12/3 is a cable that contains 3 conductor wires plus a ground wire. This matters here. First, find all the other multi-wire branch circuits OK, this is priority one. You need to get inside the panel, and search the panel for more circuits like this one. You stated they are on ...


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