Does the International Building Code (IBC), or International Residential Code (IRC) require a timer on bathroom vent fans? (I realize all code is local, but just trying to get the standard rule.)
Timer needed on bathroom vent fan
bathroombuilding-regulationstimervent
Best Answer
IRC - 2006
Also I don't think the IRC has had any major updates in this area since this 2006 publication. So no mention at all in the IRC of timers.
However...
On the west coast especially right now it is all about energy efficiency. They want everything on timers and dimmers. We did two houses in Oregon last spring and the inspector mentioned the timers we had on our fans. (I have put timers on bathroom fans for at least 10 years as my "cheap" install) So he tells us it is code but that he has been passing some without, given they promise to upgrade to this. He shot me a link and I will throw in a quote that should answer your question:
I think if I remember you are in NY. I do most of my work in IL/MO. I doubt the energy conservation codes have passed through in our areas yet. But... they are coming and it is a good thing. If you want exacts this will probably be a state by state resolution and then you have to have someone locally enforcing it. So to answer your question is it code? Yes and no. Should it be standard now for anyone doing an install? Yes.