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Thread: Fan noises

  1. 1st May 2014, 02:19 PM #1
    Albert
    Albert is offline SENIOR MEMBER
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    Default Fan noises

    I think I was asked about this informaton about my 1450 RPM/20" impeller fan.

    I have used a noise meter app on the smart phone, in a quiet office its measures 40dB (office aircon, distant conversation and typing), in my garage its 30-35dB (quiet culdesac, no wind no rain)

    when standing 3m from the fan, the measuring device 1.5m above ground(the motor is 1.5m above ground). the noise is 72-76dB.

    my 7.5kw hydrovane compressor measures 69-73 dB when measuring 3 m from it.

    my single phase combination machine measures 70-75 dB (saw, no load.)
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  3. 7th May 2014, 09:59 PM #2
    BobL
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    Default

    The usual distance used by forum members is 1m from the motor/fan.

    There are quite a few sound measurements of motors in this thread.

    1440 motor should be quite a bit quieter than 2880 RPM motors
    The motor fan noise can be a major contributor.

    BTW the accuracy of free or budget smart phone dB apps is only about +/-4 dB so it's hard to compare two measurements over the internet because even a difference of 8dB between two phones may not be significant. Using the same phone means improved relative resolution is possible,
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  4. 9th May 2014, 09:51 AM #3
    Albert
    Albert is offline SENIOR MEMBER
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    Default

    Quote Originally Posted by BobL View Post
    The usual distance used by forum members is 1m from the motor/fan.

    There are quite a few sound measurements of motors in this thread.

    1440 motor should be quite a bit quieter than 2880 RPM motors
    The motor fan noise can be a major contributor.

    BTW the accuracy of free or budget smart phone dB apps is only about +/-4 dB so it's hard to compare two measurements over the internet because even a difference of 8dB between two phones may not be significant. Using the same phone means improved relative resolution is possible,

    Thanks BobL. I think I may need a new dust extractor as the one I have is not strong enough.
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