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.)
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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