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  1. #1
    Join Date
    Jan 2013
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    28

    Don't understand about inlets and vents on furnaces; can someone explain?

    They seem very fussy about acceptable terminations on vents and inlets. Trane requires a vent coming straight out of the wall to be 12" min and 14" max. What would the harm be in running the vent out 30"? All I can think of is condensation, but they let you angle it down, so any condensation would run out.

    I am sure there is a really good reason, but its not clear to me what that might be.

  2. #2
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
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    2,599
    I'm thinking they don't want it to freeze by extending it too far away from the house. If I'm understanding ur question correctly.

  3. #3
    Join Date
    Jan 2013
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    28
    Could you insulate it to prevent freezing? Or even put a heating strip on it?

  4. #4
    Join Date
    Mar 2005
    Location
    burlington county n.j.
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    9,704
    sticking further out from the wall along with the risk of freezing would be a hazard for trip fall or something banging into and breaking it. how would it be supported?

    why would you want it out that far?

  5. #5
    Join Date
    Jan 2013
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    28
    Quote Originally Posted by t527ed View Post
    sticking further out from the wall along with the risk of freezing would be a hazard for trip fall or something banging into and breaking it. how would it be supported?

    why would you want it out that far?
    At present, the vent and inlet are under my deck. The inlet has twice picked up moisture from the vent, which has frozen and stopped the furnace. I have to go out every 8 hours to scrap.

    The piped are not installed properly, according to Trane's specs. They are too close to the deck, too close to a side wall, too close together, and the vent is not long enough. With so much wrong, a problem had to happen.

    If the vent was extended a couple feet, the inlet would not be sucking in the exhaust, as it is now. Supporting from the deck would be easy enough, and no one goes under it.

    If extending and insulating the vent a few feet is acceptable,then that is a quick and inexpensive solution. If the whole piping system has to be rebuilt to be in compliance, then it would be very expensive.

    The system could have been in compliance; I don't know why they crammed it into that corner.

  6. #6
    Join Date
    Mar 2005
    Location
    burlington county n.j.
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    9,704
    extending and insulating the exhaust would probably help.
    pics would be good so we see what you're dealing with.

  7. #7
    Join Date
    Jan 2013
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    28
    Quote Originally Posted by t527ed View Post
    extending and insulating the exhaust would probably help.
    pics would be good so we see what you're dealing with.
    Name:  pipes.jpg
Views: 247
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    You can see it is too close to the deck, too close to the side wall, too close together, and the vent is too short.
    Extending the vent 2 feet would, I expect as someone ignorant on the subject, solve the problem.
    IF it is an acceptable solution.

    According to the installation instructions, it can be set up as a single pipe, getting the combustion air from the basement. That would imply (again to an ignorant person) that extending the vent 2 feet wouldn't hurt anything.

  8. #8
    Join Date
    Jan 2013
    Posts
    28
    He seemed like he wanted to be reasonable. That is good.

    1) He conceded the inlet had a lot of ice in it. At first he insisted it was sucked in snow, but eventually agreed it was frozen exhaust.
    2) He agreed the vent was too short. He lengthened it from 8" to 14".
    3) He agreed the pipes were a bit too close together. He turned the inlet 90 fitting away from the vent, thinking that would help
    4) He disagreed about the required distance from the deck and the inside corner, saying those were a matter of code, which he didn't know right off hand.
    5) He did not think it posed a threat to the heat exchanger. He says those are continually bathed in acidic condensate, so a bit more from the inlet won't matter.
    6) He agreed that the system had 43 of the allowed 50 feet of pipe, so there was room to extend them past the deck.

    I agreed to run it this way and see if I continued to get ice. He agreed to see if he could find 2" armaflex to extend the pipes a few more feet. Although the deck is 6', the wall the pipes are next to is only 3', so if we could get out to the wall; that ought to be okay. I think.

    I have some questions:
    A) Is #3 acceptable? It is shown as straight down in the installation manual, but it is well protected from snow, so maybe it is okay turned?
    B) What is code for distance from inside corner and overhang typically?
    C) Any truth to what he is saying about the #5?

    I appreciate your help.

  9. #9
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
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    Quote Originally Posted by Toller View Post
    Name:  pipes.jpg
Views: 247
Size:  22.6 KB
    You can see it is too close to the deck, too close to the side wall, too close together, and the vent is too short.
    Extending the vent 2 feet would, I expect as someone ignorant on the subject, solve the problem.
    IF it is an acceptable solution.

    According to the installation instructions, it can be set up as a single pipe, getting the combustion air from the basement. That would imply (again to an ignorant person) that extending the vent 2 feet wouldn't hurt anything.
    This is wrong for 2 reasons....under the deck and in a corner. I'm surprised the furnaces runs at all.

  10. #10
    Join Date
    Jan 2013
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    28
    Quote Originally Posted by George2 View Post
    This is wrong for 2 reasons....under the deck and in a corner. I'm surprised the furnaces runs at all.
    Those and the vent is too short and the pipes are too close together.

    When he pulled off the 90 bend (which I didn't know you could do) the pipe was 90% full of ice. Yes, it is amazing it does as well as it does.

    If I can't get prices, then what would the normal life on these parts be?

  11. #11
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
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    2,599
    Quote Originally Posted by Toller View Post
    Those and the vent is too short and the pipes are too close together.

    When he pulled off the 90 bend (which I didn't know you could do) the pipe was 90% full of ice. Yes, it is amazing it does as well as it does.

    If I can't get prices, then what would the normal life on these parts be?
    Thank you, yes, too close together as well. I completely overlooked that other "little" mistake.

  12. #12
    Join Date
    Jan 2013
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    28
    Quote Originally Posted by George2 View Post
    This is wrong for 2 reasons....under the deck and in a corner. I'm surprised the furnaces runs at all.
    Is there an actual code that says you can't put vents under and overhang such as a deck, or they must be 36" from inside corners; or is it just a matter of common sense that they prevent proper dispersion of the exhaust?


    I am going to have a little chat with the contractor. I can show him in Trane's instructions that the vent is required to project 12" and his is only 7", and that the inlet and vent are required to be 9" apart and his are only 8". But saying that people on line tell me the vents can't be in a corner or under a deck won't be meaningful; I have to point to something like a code or regulation.

    Trane says the distance to an overhang and the distance to a corner must comply with code; but I have no idea what they are referring to. Any idea?

  13. #13
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    1,975
    We did one where we exited the house under a deck, we insualted it with armiflex and ran it our from under the deck. Never had a problem and it extended about 12' out the north side of the house under the deck.

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