I've got a contractor doing a home remodel in California. Code requires humidity sensors on bathroom exhaust fans, and in any case automatic on/off due to humidity is a feature I'd like. Considering something like the Panasonic WhisperFit FV-0511VFC1.
It also seems convenient to me to have a timer switch on the wall for manual override—set the timer, and the fan is guaranteed to run for the given time, regardless of humidity levels. Considering a switch like the Lutron Maestro MA-T51.
I'm worried that these two control schemes are incompatible: that in a normal installation, the wall switch and the built-in humidity sensor act as an "and" control rather than the "or" control I'm after.
My contractor defaults to a humidity-sensing switch, which addresses the control problem but requires a bulky sensor taking up space on the switch wall plate.
Am I understanding correctly how a wall switch interacts with fans that have built-in sensors? Is there an alternative way to wire it so that it will do what I'm after? Or perhaps I'm thinking about it the wrong way and there's a better product/arrangement I should be considering?
Appreciate any suggestions!