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  1. #1
    Join Date
    Sep 2011
    Location
    Toronto
    Posts
    4

    Smile Fan Coil - Sound Level/ Insulation

    Hello,

    We use duct liner or the insulation sheet in our units to reduce the sound from the unit to the surrounding.

    When doing a sound test we have noticed a spike at frequency of 1000 Hz on the noise criteria (NC) chart ( Sound pressure level vs frequency chart)

    What could be the possible cause of this spike at 1000 hz. As 1000 hz is the most important frequency. Could it be the scroll compressor (42 MBH)

    As of now the insulation that we use has a sound absorption coeiffient of 0.5 at 1000 hz. As we know that closer to 1 is better sound absorption.

    Apart from using better sound absoprtion insulation is there any thing else that could be done to reduce this spike.
    Which refrigeration equipments produces this spike

    Please note the spike is not that much. Say at 500 hz it shows NC 35 and then at 1000Hz it jumps close to NC40 and then comes down close to NC 35Hz at 2000Hz

    New Member
    Thank you
    Neil

  2. #2
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,186
    Not sure what code is your area but you may be able to attach a dynamat type product to the metal surfaces. "Roofing repair tape" or "window flashing tape" may also work at a lower cost than dynamat.

  3. #3
    Join Date
    Aug 2006
    Location
    TX
    Posts
    36
    we used some dynamat type stuff one time, its a butyl based deadener if i remember right. It does work, but i remember its heavy. I remember reading somewhere that homedepot sells something similar in the roofing dept, but i think its tar based

  4. #4
    Join Date
    Sep 2011
    Location
    Toronto
    Posts
    4

    Thank you.

    Thank you.

    We use drywall + insulation sheet on the metal surfaces.

    Will also consider the dynamite.

    Thanks

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