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  1. #1
    Join Date
    Nov 2019
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    Noises from Air Ducts

    Last year, I had a furnace installed (used to be a forced air). With the furnace producing much hotter air, Ive noticed a lot of noises coming from one of my air ducts. The noise is sounds like a pop of the duct expanding and contracting. I took a video from inside the duct, but the forum will not let me post a link to it . Our house is very quiet and this noise tends to happen right when the furnace goes on and then turns off. Its not terribly loud, but loud enough to keep us up at night.

    Ive located the duct in which the noise is coming from. It appears to be at a point where two pieces are overlapping. Weve had the people who installed the furnace out to look at it and they basically did not think it was an issue.

    Any help in any direction would be greatly appreciated

  2. #2
    Join Date
    Jan 2012
    Location
    Broomall, PA
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    Did they do a Manual J heat loss, and properly commission the new install? Or even evaluate the existing ductwork to see if it would handle the proper flow rate.

    Probably the new furnace blower motor is a different speed (higher) than the old furnace, causing the noise.

    If the air is significantly hotter, might shorten the life of your new unit.
    Does a continuous call for heat have the unit bouncing off the high limit, IOW, burners come on and off, blower keeps running?
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  3. #3
    Join Date
    Mar 2018
    Location
    Chico, Ca #StateofJefferson
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    Measure the temperature of the air entering the furnace and of the air about 10' from the exit of the furnace with a digital thermometer, this number is called a temperature rise, the allowable min-max is listed on the furnaces ID sticker on the inside of the furnace. If the installers didn't at least check the temp rise and ducting static pressure then they dont know what their doing and are wasting your money. This appliance can and does kill Americans every winter thru bad installation, service and maintenance, seems you may want to hire someone that actually knows what their doing instead of rolling the dice.

  4. #4
    Join Date
    Nov 2006
    Location
    Athens, Ohio
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    What do you mean "used to be a forced air?" Isn't the new one a forced air? They're all forced air if there is a blower.
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  5. #5
    Join Date
    Dec 2007
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    9,303
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    Quote Originally Posted by mhanson View Post
    Last year, I had a furnace installed (used to be a forced air). With the furnace producing much hotter air,
    What does this mean?

    It is still forced air if you are using ducts.

    Do you mean it was a heat pump and now it's fuel burning?
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