Choosing a fan for an OEM application usually starts with the wrong question. The real question is not “which model fits my duct” but “which series matches my duty point, power source and environment.” CentriFan Intl builds 225 external rotor fan models across eight series, all factory-direct from Shanghai.
Eight series, one architecture
Every CentriFan fan uses an external rotor motor — the impeller mounts directly on the motor rotor, eliminating belts, pulleys and shaft alignment. That architecture gives compact axial depth, low vibration and long service life. The differences between series are in impeller geometry, power type and protection level.
- EC Backward-Curved Centrifugal (53 models) — energy-saving EC motors, speed controllable, 63–630 mm. Best for AHU, fresh air ventilation and HVAC systems.
- B-Series Backward Curved (58 models) — robust single and dual-inlet designs for higher static pressure duties.
- F-Series Backward Curved (48 models) — high-efficiency single-inlet blowers.
- Axial Fans (63 models) — external rotor axial fans from 63 mm to 630 mm, AC and EC, for through-flow ventilation.
- Forward-Curved Centrifugal (22 models) — compact wheels, high airflow at low noise, dual inlet.
- Explosion-Proof Axial — FBD (16 models) — DC-powered for hazardous areas.
- Explosion-Proof EC Axial — FBE (13 models) — EC motors with explosion-proof construction.
- Box-Type Centrifugal (3 models) — cased forward-curved single-inlet units.
Start with your duty point
For most HVAC and refrigeration OEM projects, the decision narrows to two axes: pressure (backward-curved centrifugal wins at higher static pressure) and power source (EC for speed control and energy savings, AC for simplicity and cost). Explosion-proof series apply when the fan operates in classified hazardous zones.
All models are CE and RoHS certified. Need help matching a series to your application? See our Fan Applications page or ask our engineers — we answer within 24 hours.