Those who know something about fluid dynamics can also tell you that if
the air flow is restricted, the fan speed will be a bit higher (for any
given KPA500 selected fan speed) - it is because the fan is not doing as
much work to move air.
Try an experiment with any fan - partially block the air flow and
observe that the fan speed increases.
That is more noticeable if the outlet side is blocked - so do maintain
the proper clearance at the back of the KPA500.
73,
Don W3FPR
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