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About 6 years ago we did a remodel. The electrician stated that a fan control was required in our laundry room, one of those things that looks like a dial and periodically turns on the fan. I really hate the things, I can turn on the fan myself - and really it is never needed there. But I digress -

Both fan countdown timers installed at that time are buzzing constantly and I need to replace them. At the same time, I was thinking about just putting the fans on a z-wave controller and then I can schedule whatever I want - or even turn them on when away on vacation.

Roundabout, my question is this: Are these kinds of timers (the round ones that click at certain times and turn the fan off and on) really required in a laundry area? How about for a bathroom? Would it be permissible to use a z-wave controlled switch instead?

Washington State, US.

Thank you.

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No. Timers on exhaust fans are not required in a laundry area in Washington State, nor any other state, that I'm aware of.

If your z-wave switch is UL listed for fan control, then it's permissible.

This code excerpt makes no mention of specific rooms.

  1. Local exhaust ventilation systems. Local exhaust ventilation systems shall be controlled by manual switches, dehumidistats, timers, or other approved means.

(LOCAL EXHAUST. An exhaust system that uses one or more fans to exhaust air from a specific room or rooms within a dwelling.)

–Chapter 51-52 WAC. STATE BUILDING CODE ADOPTION AND AMENDMENT OF THE 2015 EDITION OF THE INTERNATIONAL MECHANICAL CODE, wa.gov

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