When installing fixtures, changes often occur during the job. If the fixture requires two switches, always use 14/3 Romex, even if you anticipate changes. Additional wiring can remain safely inside the wall indefinitely, provided all junction boxes are properly assembled. If the installed unit does not need the planned double switches for the light and fan, one switch can be safely capped off with 1-g sw filler blank. Usually, no additional junction box is needed at the fixture because it has its own built-in junction box. Proper exhaust fan sizing can be found online. Be aware that a fan with too low a CFM may fail to remove odors effectively, while an excessively large CFM can cause noise issues. However, in most cases, exact sizing is not critical as long as the fan is not undersized.
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I am having a problem i am putting in 2 switches one for the light one for the exhaust fan for a bathroom i have 3 sets of wires one is hot from the breaker white, black, ground then one for the light same color and another for the fan same color i hook it up the way i thought its suppose to and trips the breaker what am i doing wrong please help
If you do not understand a 3-way light circuit, I would have a very hard time explaining here. I would suggest hiring an electrician for that one if you do not understand.