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    joeblue's Avatar
    joeblue Posts: 4, Reputation: 1
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    #1

    Mar 14, 2009, 07:43 AM
    Furnace noise
    I have a Lennox gas furnace that has started making a noise through the ducting that sounds like rain drops hitting the roof during a good rain. What could this be?
    WallyHelps's Avatar
    WallyHelps Posts: 1,018, Reputation: 136
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    #2

    Mar 14, 2009, 02:15 PM

    If I had to guess, I would say it is the ductwork expanding as the warm air passes through it. Or the ductwork moving relative to some part of your house, like a floor joist. If you can find where the noise is coming from in this instance, you can wedge something between the duct and the joist to stop the noise.

    Good luck finding the noise,
    WallyH
    Mikie D's Avatar
    Mikie D Posts: 45, Reputation: 1
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    #3

    Mar 14, 2009, 02:49 PM

    Do you have a high efficiency furnace with pvc exhaust and fresh air make up , if you do the exaust is not pitched back enough to the furnace and then to the trap and drain, that will create water running or droplet noise. Mikie D
    joeblue's Avatar
    joeblue Posts: 4, Reputation: 1
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    #4

    Mar 17, 2009, 03:03 AM
    Quote Originally Posted by Mikie D View Post
    Do you have a high efficiency furnace with pvc exhaust and fresh air make up , if you do the exaust is not pitched back enough to the furnace and then to the trap and drain, that will create water running or droplet noise. Mikie D
    The house is 5 years old so I assume it's high efficiency. The exhaust is typical duct material not pvc . This noise just started I never heard it before.
    Mikie D's Avatar
    Mikie D Posts: 45, Reputation: 1
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    #5

    Mar 17, 2009, 05:18 PM

    If it doesent have pvc piping for fresh air and exhaust its not high efficiency but what you could try is look for a ductwork joint and pull out the slips and drive and disconnect supply ductwork and spread it apart and if it stops have a cavas connector installed also your saying you have a chimney or triple wall exaust to the outside or in a chase let me know I'm interested. Mikie D
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #6

    Mar 17, 2009, 07:22 PM

    When you say ducting, do you mean exhaust venting, or furnace ductwork? Where and when is the noise heard.
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
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    #7

    Mar 17, 2009, 07:39 PM

    Check to see if your system is iceing up, could be driping through the furnace, look for ice or frost on the refrigerant lines when it is running. Good luck, Mike
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