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Thread: Anybody know anything about venting a clothes dryer?

  1. #1
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    Anybody know anything about venting a clothes dryer?

    I've posted this on a GardenWeb subforum that deals with laundry rooms, but thought I toss it out here because we need an answer asap (provided the contractor actually chooses to show up tomorrow).

    We have 3 options (well, actually 2, option #3 is a bit "out there") for venting our gas clothes dryer. Can anyone please advise which may be the best one?

    1. Go out the back of the dryer, a 90-degree turn straight up 8' through the roof.

    2. Out of the back, a 90-dgeree turn up 4',another 90- degree turn, then a 9' horizontal run to go through an outside wall.

    3. Go out the back,a 45-degree turn down to the floor (run of about 4'), then 4 45-degree turns, along a 14' horizontal run out to the outside wall.

    The question basically is, will the venting work better to come out of the dryer at 90-degrees and go up 8', or is it better to not vent vertically at all and go mostly horizontally even with a bunch of turns in the ducting? I realize that lint can collect at all turns, and that most places advise against ducting a dryer up through a roof, but these really are our only options at this point.

    Our contractor is a total idiot (sorry, it's me who is "venting" now...)
    Vicci


    Can't you just eat what I put in front of you? Do you have to know what it is?
    Ria Parkinson, Butterflies (BBC, 1978-83)

  2. #2
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    I've never had a laundry room that wasn't along an outside wall, so I am confused where yours is located within the house. However, I would not want the venting to run up - since what goes up must come down, so whatever option that would be for you - with the least distance to to the outside, is what I would pick. Hope someone can help you more.

  3. #3
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    Here is some info that might help.

    http://www.appliance411.com/faq/dryer-vent-length.shtml

  4. #4
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    Vicci - your option #2 is just about what I have, only I go out the back of the dryer, 90 degrees down about 2 feet, then 90 degrees and out at least 8 feet. Be sure the elbows used are fastened securely to the rest of the ducting and don't have any places where lint can get caught. Mine weren't, and I had to have someone go back and figure it all out when the dryer stopped working correctly.

    We were strongly discouraged from going straight up and through the ceiling, but that may have been more due to the work involved. The duct work as described above goes through the crawl space so it's easily accessible.
    There cannot be a crisis today. My schedule is already full.
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  5. #5
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    Thanks for your input.

    The washer/dryer (a combo unit) is on an inside wall. It was next to an outside wall, where it was previously vented, but the room was enlarged. Now there is no room for the unit to be moved to an outside wall (since we would need to move plumbing as well and the room is built on a concrete slab).

    MinEaston, I was leaning toward #2 as well, since (what Cafe Latte said) what goes up... and that's a lot of lint accumulation. Unfortunately, our ducting will not be hidden in a crawlspace since the contractor finished those walls before he decided to look a few steps ahead...

    Also, MinEaston, does your dryer seem to take care of the lint problem through the in-unit filter, or did you install some sort of filter near the elbows, or just clean out the ducting regularly?
    Vicci


    Can't you just eat what I put in front of you? Do you have to know what it is?
    Ria Parkinson, Butterflies (BBC, 1978-83)

  6. #6
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    I clean our dryer filter every use and our vent still developed a block. some birds set up housekeeping in the vent area and semi blocked it, and then dust started backing up.
    important you can get to both ends of the ducting. we can blow ours out with a leaf blower.
    "If the world were a logical place, men would ride side saddle." Rita Mae Brown

  7. #7
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    Are all three options code?

  8. #8
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    Quote Originally Posted by Gumbeaux View Post
    Are all three options code?
    Surprisingly, yes. Or at least that's what the Contractor From Hell is telling me...
    Vicci


    Can't you just eat what I put in front of you? Do you have to know what it is?
    Ria Parkinson, Butterflies (BBC, 1978-83)

  9. #9
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    The one in our old house was mostly horizontal with just enough gain to clear the cement foundation wall in the basement. Our current house has a horizontal vent through an outside wall. In our climate, if we went vertical through the roof we would have to consider leaks (rain or melting snow/ice), barriers from snow sliding/ice dams, and potential heat loss. Much more simple to go horizontal and vent into a sheltered area. The fewer the number of turns needed the easier the maintenance is if you do have problems. I vote for option 2.
    Anne

  10. #10
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    Thanks, Anne. So many opinions, but I think that we have time seeing that the contractor is now showing up 1-2 days per week. With all of the other work yet to be done, this may not be done for a month!
    Vicci


    Can't you just eat what I put in front of you? Do you have to know what it is?
    Ria Parkinson, Butterflies (BBC, 1978-83)

  11. #11
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    Quote Originally Posted by VictoriaL View Post
    Also, MinEaston, does your dryer seem to take care of the lint problem through the in-unit filter, or did you install some sort of filter near the elbows, or just clean out the ducting regularly?
    I clean the dryer filter each time I use it, and the guy who fixed the venting said to stick a shop vac hose down there two or three times a year to take care of the issue. Once the weather gets consistently warmer and the painters are done outside, I'll hang more than I use the dryer, so the venting will get a respite.
    There cannot be a crisis today. My schedule is already full.
    -Henry Kissinger

  12. #12
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    Quote Originally Posted by MinEaston View Post
    I clean the dryer filter each time I use it, and the guy who fixed the venting said to stick a shop vac hose down there two or three times a year to take care of the issue. Once the weather gets consistently warmer and the painters are done outside, I'll hang more than I use the dryer, so the venting will get a respite.
    Good idea about the shop vac hose. I always hang my laundry outside to dry if I can, and I had originally said that it didn't matter what venting we used since I don't use it all that often (except in January and February in most years) but I don't know what usage any future house owners will have so I can't limit. Alas.
    Vicci


    Can't you just eat what I put in front of you? Do you have to know what it is?
    Ria Parkinson, Butterflies (BBC, 1978-83)

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