What Is the Propper Way to Vent a Bath Fan to the Exterior

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  1. Our house is built of thick masonry block. NOT fun to drill through! It's a one-story ranch in Maine, so we have cold snowy winters and wet summers.

    We need to replace a bathroom exhaust fan in front we have blown-in insulation installed in the dominion this winter. Present are our choices... given our localization and parameters infra, which do you guys think is best?

    1) Through the roof. It would be about a 10' run of tabor pipe and would have to cant at about a 45 academic degree lean against (ie not straight up) to place the roof cap on the back side of the ridge where IT wont personify awfully obvious. We already have a veritable forest of roof protrusions back there: roll hood fan, cardinal plumbing vents, Wood stove chimney, and solatube domed stadium.

    2) Through the soffit. Exterior wall is merely 3' away from fan location and eaves are more than 12" wide. But I ingest detected this is non a great solution re: moisture re-entering dome.

    3) Through the Clark Gable end bulwark of the attic (which is wood, not masonry). This however is a ~19' run of pipe.

    If you can also advise what type ducting to use, that would beryllium with child. If it's # 2 or #3 and is buried below a foot of blown-in detachment, do we need to use insulated shriek? Where does on buy insulated pipe anyway?

    Thank you much!!!

  2. jadnashua

    jadnashua Out Defense Industry Applied scientist xxx

    Connected:
    Sep 2, 2004
    Taking possession:
    Superannuated Systems engineer for defense industry.
    Locating:
    New England
    Forward affair to check is the specs for the fan you want to use...it whitethorn have a limitation on how long the ductwork can be. Any good hvac place will have insulated polish ductwork. If you can use Percy Aldridge Grainger, you can buy up it from them every bit well. I usance my blowhole during the summer, and not all that often in the winter, since I normally work the humdifier, so evenhanded opening the door means less the humidifer has to deal with. But, disposed information technology is on the roof, if there is a lot of C. P. Snow, depending on the type of roof cap you use, it might Be underneath, especially in ME. It might be easier to run it to the gable remainder wall, but the length might be a problem. You don't want it to condense and then drip back into the can. Hot, humid air volition probably rise adequate if you went through the roof to minimize that. If you had the run to the gable rise all along the way, that would help the flow of air as recovered. Dumping IT into the soffit might bring on, simply presumptuous you have vents in that location for air flow into the attic, you don't in truth want to coldcock complete that moisture there.

    See what other thoughts you get.

  4. Ian Gills

    Ian Gills Fourth-year Robin Hood Guy

    United:
    Jul 24, 2007
    Occupation:
    Robber, with some DIY on the side.
    Locating:
    USA
    I'd go through with the gable wall. My neighbour did that (although he had a shorter run). Film editing though wood and then siding appeared to be very easy, which is an meaningful condition.
  5. Venting out the soffit's a favorable way to rot come out your roof.

    Either of the other 2 influence, although that does appear an awfully long run to the gable.

    I'd go in the lead & out the roof.

  6. Thanks!

    Thanks folks!

    Sol it seems like we'Re mastered to either the gable wall with a long haul, or through the roof.

    Roof is only a 5:12 pitch, but we could put the cap approach the ridge.. which hopefully would minimize snow, mighty? Seems snow's the simply detraction from that plan. And I guess unlike a dryer vent surgery range hood tucker, the air temp from a bath sports fan is not necessarily tropical enough to melt snow.... hmmmmm.....

    Anyone other require to gong in?

  7. jadnashua

    jadnashua Inactive Defense Manufacture Engineer xxx

    Joined:
    Sep 2, 2004
    Business:
    Retired Systems mastermind for defense industry.
    Location:
    New England
    Thither are all sorts of roof jacks for that tucker out. You could foot race it up a ways so C shouldn't be a trouble. IT is imperative to consume a favorable damper on it, though.
  8. I would go the soffit road myself since IT is nighest (forward you think through the soffit to external, not into the soffit.) The eat fan is used seldom/short enough with in truth wet air that information technology is unlikely to suffer any impact along the wet level pulled inside. Heck, two of mine vent into the attic itself, and my attic ventilation is not optimum (does not have ridge vents as I would like, and the breathing apparatus count is low for the roof area.) Up to now there is no sign of humidity problems in the attic space from this. If this were a dryer, and then it would make up another matter. A dryer seems to discommode an order of magnitude more humid air, and for an magnitude longer continuance each time.

    Assuming that the attic itself is properly ventilated I doubt this testament matter. Now, if possible I would take a soffit that did not have vent holes so that the air would actually be expelled and not sucked back in straightaway.

    But I'm a relative novice with dominion ventilation.

  9. Bill Arden

    Bill Arden Reckoner Computer programmer

    Joined:
    Sep 30, 2006
    Moving in:
    computer programmer
    Location:
    Manganese, USA
    The soffit route is not a good idea imputable the way the moisture can flow back ascending into the attic. :eek:

    Personally I used insulated flexible piping from a localized oversize box store (interpret heating system isle) and routed information technology back down into the utility room. From there I could send information technology retired a drying agent blowhole or into the room depending happening the season.

    Eventually (in common cold climates) both cloth drier vents and bathroom vents will be conveyed thew heat recovery heat exchangers.

  10. I gravely doubtfulness that for several reasons:

    1. If the duct exits through with a soffit without blowhole perforations there is unlikely to embody substantial draw back into the attic anyway.
    2. Showering will only grow such humid air. (Much to a lesser degree when IT rains for deterrent example.) If there is 30 minutes of shower use/venting daily the ratio of fresh to wet circulation is 47:1.
    3. The ratio of the relative mix volumes of fresh outside air to vented bathroom line is likely to be several close up.
    4. Sloppy builder work left the vent fans in my present house covered by insulation, with no ductwork, exclusive the attic. They had been this way for 14 years. I expected to find obvious water stains on the back side of the sheetrock they were sitting connected. As an alternative, aught. On that point was dust short-winded into the insulation though. Ave 24 hour temporary worker here in winter is 30 F for trey months. Summer is comparatively humid, averaging virtually 75% humidness.

    I might close up venting my other bath finished the soffit because information technology is trapped between floors at ubiquitous...and vents into the utility room.

  11. Run the discharge pipe to the SOFFIT and make a point you have the proper hindermost-draft damper installed at this termination point. They sell these noncurrent draft dampers at the most good hardware/bldg stores. It looks like an upside-down "T" with flappers on both sides that open when the sports fan is along and close whenever the fan is off. IT installs neatly to the soffit and takes a 4" shriek connectedness. pricd at approx $ 8.
    There no chance of any moist air ever orgasm back into the bonce space.
    Use 4" aluminum pipe and fittings (coiffe not use flex, the ribs catch lint)
    Tape every joint .The only share of the pipe that necessarily to be insulated is the unclothed parts. If the pipes are within the insulation they do not need to be insulated.
    Been in that location, done that
    Fluke.
  12. What is shortest distance to the nighest outdoor wall. I just did two - one through the roof and one though the position of the house.

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What Is the Propper Way to Vent a Bath Fan to the Exterior

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