Centrifugal fan shaft power after a VFD speed change

Oct 20, 2026 · America/New_York

HVACPE

A VFD ramps a centrifugal supply fan from 50 Hz to 60 Hz on the same system curve. Treat air as incompressible. How does shaft power change?

Practice only — not PE exam credit, not an NCEES item, not a PE stamp, and not a substitute for licensed professional judgment or licensure. Original workbench questions for discussion. Verify against current codes and your own calculations. Terms