Reply to "Strobic Air Fan Problem"

If the motor isn't shimmed properly you could have a frame distortion issue. But since this is your first reading it might also be some unbalance. I would check and correct for soft foot and if that doesn't bring the 1X down, try trim balancing. Since the fan is overhung, the axial vibration could be a product of some couple unbalance, the difference between H & V could be stiffness differences.
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