Centrifugal Fan vs Axial Fan: Which Should You Choose?

It's not about which fan is "better" — it's about which physics matches your system. Here is how axial and centrifugal fans differ, and a decision checklist.

The Core Difference in One Sentence

Axial fans move large volumes of air at low static pressure, along the motor axis.
Centrifugal fans move air at a right angle, building high static pressure — ideal for ducted systems.

Axial Fans: High Volume, Low Resistance

An axial fan draws air in and pushes it out along the same axis, like a table fan or propeller. Air enters and exits parallel to the shaft.

Huge airflow for its size.
Limited pressure — a single-stage axial fan typically tops out around 300 Pa.
Great for open spaces: wall ventilation, condensers, heat exchanger air movement, general cooling.
Watch the stall region: if system resistance climbs, airflow can become unstable.

Centrifugal Fans: High Pressure, Ducted Systems

A centrifugal (radial) fan uses a wheel that flings air outward to a scroll housing. Air enters the centre and is discharged at 90° to the inlet.

High static pressure — typically 200 Pa to 3,000+ Pa in a single stage.
Excellent against resistance — overcomes filters, long ducts, coils and process equipment.
Two main wheel types:
- Forward-curved — compact, high airflow at modest pressure, great for small AHUs and appliances.
- Backward-curved — steeper pressure curve, more efficient, and non-overloading; the workhorse of commercial ventilation.

Quick Comparison

Criteria	Axial Fan	Centrifugal Fan
Single-stage static pressure	0 – 300 Pa	200 – 3,000+ Pa
Airflow vs size	Very high	Moderate
Best in	Low resistance, open spaces	High resistance, ducted systems
Typical failure mode	Stall under rising backpressure	Motor overload (forward-curved only)
Footprint	Low profile	More compact for high pressure

Decision Checklist

Define your airflow (m³/h or CFM) from heat load, air-change rate or process need.
Calculate total static pressure — add friction from ducts, filters, coils, hoods and fittings.
Rule of thumb: if system resistance is low, go axial; if it rises steeply (filters, long ducts, process kit), go centrifugal.
Consider speed control — EC variants of either type let you tune airflow and save energy.
Match materials and protection to your air quality and environment (see our IP rating guide).

What If You're Not Sure?

The safest path is to share your operating point — required airflow at a given static pressure — with a fan supplier. ANENG builds both axial fans (120–910 mm) and centrifugal fans (133–710 mm) in AC, EC and DC versions, and our engineers can guide you to the wheel type and size that matches your system curve rather than oversizing "to be safe."

Not Sure Which Fan You Need?

Send us your airflow and pressure requirements and we'll match the right axial or centrifugal fan to your system.

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