Fan required to turn on with light required by Code ?

Discussion in 'Shower & Bathtub Forum & Blog' started by Scuba_Dave, Dec 17, 2009.

  1. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    This is the 1st I have heard of this
    I have never heard of it or been in any house or Apt where it is setup like this ?

    Person stating it is in the same State as me - MA
    Why would you want a fan on exhausting warm air in the middle of the winter if you are just brushing your teeth or hair ?
  2. frenchie

    frenchie Jack of all trades

    I don't know who that quote is from, or which thread, but maybe ask them for the code reference?

    AFAIK, you're right. Or would be, in NY.

    The requirement for bathroom ventilation is in R303.3 - says you need an openable window, or a fan (20 cfm if constant, or 50cfm if intermittent). But it doesn't say anything about having to be on the same switch as the light. Not only that - in NY, the energy codes say it has to be on a separate switch.
  3. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    Thread on another forum

    http://www.diychatroom.com/f18/finishing-basement-need-review-plans-59302/

    I did ask for a code reference & he only stated it wasn't in the NEC (I never indicated it was)

    He simply stated 2x:
    I knew you needed a window or fan, I have both
    Every new house I see has 2 switches, fan is always on a seperate switch
    I have 3 switches, one outside the door turns on the overhead light
    One inside turns on fan, 2nd turns on the vanity lights
  4. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    It would not be in the NEC, and it would not be in the plumbing code. It might be in the building code. Around here, unless they have updated it, if there is a window, they do not require a fan.
  5. frenchie

    frenchie Jack of all trades

    Do you have the Massachussets code? I know it's based on the ICC codes, as ours are, but states often amend the codes.

    This is what 303.3 looks like in the NY State codes:


    I know some states have modified it to require ventilation, window or not. But this hooking it up to the light thing? ... Never heard of that.
  6. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    No, don't have the code book
    I'm aware of the need for fan or a window to meet code
    But never heard of having the fan come on with the light
    Every newer house I have ever seen around here has a seperate switch
    Even most older houses have been updated to seperate switches
  7. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    I think the guy is talking (typing) out his posterior Dave.
  8. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    Yeah, that's what I am thinking
    I know I can't cite code out of NEC without looking it up 1st
    I was hoping he might be able to come up with some code reference
    But unless something has really changed (and no-one knows about it) then I think he is a little mixed up

    We actually need the added humidity in the Winter
    House has dropped to around 40%...static electricity now
    My son gets a kick out of that :D
  9. FloridaOrange

    FloridaOrange Plumbing Designer

    Messages:
    1,317
    Location:
    SW Florida
    Trade you humidity. :D We hit below 60% maybe a couple times of the year. Usually it's anywhere from 85% to 100%.

    You get to keep the snow though, deal?
  10. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    IF there were any code regarding this, which I can't cite, it would probably mandate SEPARATE switches as part of the energy issue...use the fan when needed without running lights!
  11. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,048
    Location:
    Cave Creek, Arizona
    fan

    Many, if not all, commercial sites have the fan wired to the light. in small rest rooms, not the large ones with a continuous fan. One reason being that it keeps the fan from being left on when the light is off, which means there is no one in the room.
  12. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Messages:
    885
    Location:
    South of Boston, MA
    Ha !! There is a storm headed up the coast that may dump up to a foot on us
    I'm hoping Ian gets buried with it & not us
    I used to go to Florida ever year for vacation in early Spring

    Checked & we are down to 30% this morning....cold front moving thru
    It went down to about 7 around here last nite :eek:
    Basement has dropped to just below 60
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