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Bath Exhaust Fans & Code

Knightdiamond | Posted in General Discussion on July 23, 2006 06:33am

Hey All,

 Got a question. Am “helping” (Actually, I am takin it in the shorts but he is a friend) a guy out who did not install exhaust fans in the baths of a duplex. Now, the baths have no exterior wall. One wall is shared with the stairwell and the stairwell has an exterior wall. Its is a two story job. (Obviously, by the stairwell.) I want to install a fan in the stud bay between the stairwell and the bath, vent it down to beneath the stairs and under the stairs to the exterior wall and out. My question; Can I install a fan in the wall? (Up high. Roughly 6″ from ceiling) Normally they are in the ceiling but it would be a huge undertaking to install in the ceiling. I pored over my State Code. (TN) and I pored over the IRC 2003. (I know 2006 is on the streets but I don’t have one yet) Nothing says I cannot do what I want to do. I see no problems with it. Any of ya’lls  comments would be appreciated.

                                                                     KD

BTW- Does “DW” Mean Da Wife? (I got Dry wall already)


Edited 7/23/2006 11:42 am ET by Knightdiamond

Reply

Replies

  1. sawdust58 | Jul 23, 2006 06:40pm | #1

    I have seen fans in walls but they do not last as the vertical as opposed to horizontal mounting causes premature bearing failure. Also a fan should be at the high point of moisture collection (the ceiling) to do an adequate venting job

    Take down a strip of sheetrock, get an angle drill and drill your way to the outside, put in a good quality quiet fan and you are set

    1. Knightdiamond | Jul 23, 2006 06:46pm | #3

      Hi Steve,

      Don't know what the angle drill will do for me. But the ceiling is just out of the question unless code requires it thata way. (I don't even know which way the floor joist lay) If its code and I can reference it then I gotta do it. But I just can't find it in the reference material. Thanks though!

                                                                      KD

  2. User avater
    BillHartmann | Jul 23, 2006 06:44pm | #2

    There are fans made specifically for wall mount.

    http://www.qvc.com/asp/frameset.asp?aol_refer=false&msn_refer=false&nest=http://www.qvc.com/scripts/detail.dll?item=V50715!tpl=DETAIL!ref=GBA&ref=GBA&cm_ven=GOOGLEBASE&cm_cat=HOME%20IMPROVEMENT&cm_pla=HOME%20ENVIRONMENT&cm_ite=V50715
    http://www.atrendyhome.com/pafvwhwa70cf.html

    http://www.rewci.com/exmobafanfap.html

    But the last one looks like it is designed for an exterior wall and directly vents out the wall.

    But it looks like it has a standard discharge that could possilbe be routed down the wall and out.

    You need to check the specs on these.

    Also note that the CFM specs on the fans is with a realatively short discharge line. You will need to go up in size to get good air flow with the amount of line that you and the bends.

    1. Knightdiamond | Jul 23, 2006 06:50pm | #4

      Hi Bill,

      Thanks. I'll check'em out. The distance is roughly seven feet with only one 90degree turn. But my CFM will be limited to what I can squeeze into a stud bay. Of course I could squeeze a 12' dia duct in there but it would be awful "squished"!!! (Its tough sometimes to do the right thing! LOL!)

      Can I assume by the fact that they are sold it is within code? (Boy stickin my neck out on that comment!) LOL!

      Thanks, again, Bill.

                                      KD

  3. User avater
    BossHog | Jul 23, 2006 06:56pm | #5

    My Brother did soemthing vaguely like that with a conventional bath fan.

    He didn't want to tear into the walls or ceiling, so he built a small wood box for the fan, and fastened it to the wall and ceiling. Then he ran the duct through the wall.

    Don't know if it would work for you, but I thought it was worth mentioning.

    Sex is a bad thing because it rumples the clothes. [Jackie Onassis]
  4. calvin | Jul 23, 2006 08:31pm | #6

    The only code issue I could think of would be the fire separation / rating on that stairwell in a duplex.

    A great place for Information, Comraderie, and a sucker punch.

    Remodeling Contractor just outside the Glass City.

    Quittin' Time

     

  5. User avater
    trout | Jul 24, 2006 04:48am | #7

    Are you cutting any top or bottom plates?  If so, how can you run the requisit metal straps on either side of the plate for reinforcement?

    1. Knightdiamond | Jul 24, 2006 03:34pm | #8

      Hey Trout,

      No, my plan is to remove a piece of DW approx 6' long and 16' wide to reveal the stud bay. Install the fan at the top as close to the ceiling as I can and duct down to approx 18" above the floor and then install a 90 deg el and duct straight out under the stairs to the outside. Pretty straight forward. About 7 ft of duct. I have a 50 CFM fan and I intend to wire through the bottom plates to the switch. Have not decided on the type of switch yet though. I'd like to wire the light and the fan together so I don't have to install a double switch box. Thata way when the light is on the fan is on. But the quick answer is I have no intention of cutting into any framing. Only two wire access holes in the plates and the exhaust hole in the siding. Thanks for you input.

      KD

      1. User avater
        BillHartmann | Jul 24, 2006 04:23pm | #10

        "Have not decided on the type of switch yet though. I'd like to wire the light and the fan together so I don't have to install a double switch box. Thata way when the light is on the fan is on."If you do that make sure that it is a quiet fan.http://www.efi.org sells a switch for that purpose with an adjustable timer so that you can have the fan run for a certain time after the light is turned off.

      2. BryanSayer | Jul 24, 2006 06:58pm | #11

        Would a remote fan help at all? You can use flex ducting with them. Aldes makes one, and Fantech. There are probably others.

        1. Knightdiamond | Jul 25, 2006 03:13am | #12

          Hi Bryan,

          Well, at this point its not an installation problem, (I got that figured out) it was just a code problem and I have done my DD and can't find a reason to not do it my way.

          I have the code  para that tells me I have to do it. I just don't have any code that tells me I can't do it my way. So I am off. Gonna start tomorrow! Gotta "get'er dun"!

          Thanks to everyone for their input. This is the best place to get good info! (And a sucker punch! :-)) 

          Off to see the wizard!

                                                   KD

          1. User avater
            trout | Jul 25, 2006 06:13am | #13

            Sounds like a workable deal to me.  :-)

  6. User avater
    maddog3 | Jul 24, 2006 03:47pm | #9

    DW = Dear Wife....

    Darling Wife,

    and, thanks to you,
    Da Wife

    .

    .

    .

    .Wer ist jetzt der Idiot

    ?

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