We have an existing 120V AC exhaust fan wired to simple inline attic fan style thermostat. We would like to add a timer switch so the fan could be manually turned on as needed.

Would this be the correct way to add a timer switch?

enter image description here

This is the sort of timer switch we are looking to add: 12 hour timer

  • Is this for a fan in the attic, or is it for a repurposed attic-type fan?
    – mjohns
    Jul 23, 2015 at 23:06
  • It's a 300 CFM bathroom fan in the ceiling of a storage room that is vented out a side wall.
    – Marc M.
    Jul 23, 2015 at 23:39

1 Answer 1


Yes, that is precisely correct. Though I prefer red tape, but that's a preference, not a requirement to go buy a roll. Nicer (IMHO) because you can easily mark switched hots whether they be black or white.

  • I like the idea of using red tape, definitely makes it more visible. Thanks.
    – Marc M.
    Jul 23, 2015 at 23:44

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.