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Hi all,

Recently our primary air fan had indicate high vibration around 3.0 mm/s rms overall.. fan speed is 1490 RPM and damper opening around 90%..
When we look into the spectrum, there were harmonics pattern with dominance 4x which is 1.74 mm/s rms.What become my question is where is 4x is coming from? harmonics in spectrum give the idea of there is a looseness happen..can anyone had better idea?
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