Selecting a centrifugal fan starts with the air flow (m³/h) and total pressure (Pa) your system actually needs, not catalogue peak figures. This guide walks through reading a system resistance curve, choosing the right series — 4-72 for low-pressure ventilation, 6-30 and 9-26 for higher pressure, GM for high-volume milling air — and adding sensible margin for fouling and altitude.
We also cover why every impeller should be dynamically balanced to G6.3 and why a full-load run test before shipment protects you from vibration problems on site.
