In many heavy-duty equipment applications,
centrifugal blowers must perform consistently and reliably over a range of flow at or near constant pressure. Unfortunately, in this situation, conventional
centrifugal blowers consistently fall short of reliable performance as a result of surge, which is an instability that develops between the
blower and duct system during reduced flows and is generally characterized by periodic pressure fluctuations of 25 percent or more of the
blower static...
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