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Old Jan 26, 2013, 04:38 PM
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USA, MD, Frederick
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Was this your first run-up in the fixture? How fast did you increase the throttle?

Those plastic EDF shrouds are relatively easy to flex and deform. If you raise the throttle gradually, you will be able to detect if the blades are rubbing at a lower RPM. When mounting the unit, I suggest doing it with the lip ring installed as a brace to minimize the chance of the duct flexing.

You also do not need to go to full power to balance, just enough where vibration starts to happen, and then consistently return to that setting during the balancing process.
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