Axial Fans

Axial Fans — selection guide

Axial Fans: 435 models, impellers Ø145–1,000 mm, maximum airflow 23–48,326 m³/h, static pressure to 3,690 Pa, AC, EC and DC motors, across 98 series. 96 of them carry a measured P-Q curve and 395 a dimensional drawing.

The axial range covers Ø145 to Ø1,000 mm in five lines that overlap in diameter but not in job. LWAA AC external-rotor fans (2-, 4-, 6- and 8-pole) are the fixed-speed workhorses for condensers and heat pumps; LWAE3G EC fans add speed control and part-load efficiency on the same mounting dimensions; LWAD3G DC fans serve 24 / 48 V and 310 V DC-bus equipment; LWWAF and LWEA industrial fans move very large volumes at low pressure in wall rings and casings; and LWMFAF / LWEAF tube axial fans handle higher pressures inside a duct.

Most models are IP54 with cold-rolled-steel or PA66 impellers, rated for −30 to +60 °C ambient (EC: −25 to +60 °C), on maintenance-free ball bearings. Three-phase 380 V and single-phase 220 / 230 V versions exist for nearly every size, and the largest EC fans (Ø500–900 mm) are three-phase.

How to select from this range

1. Use the airflow at the coil or grille and the resistance it creates — a condenser coil and guard grille cost 30–80 Pa, which is a large share of an axial fan's pressure capability.
2. Choose diameter for airflow and speed grade (pole count or EC speed setting) for pressure and noise; two adjacent diameters usually cover the same duty with 3–6 dB(A) difference.
3. Stay on the falling, right-hand part of the curve. Left of the pressure peak an axial fan stalls and the noise rises sharply.
4. For condenser pressure control, night set-back or redundancy choose EC (LWAE3G); for constant duty at lowest cost choose AC (LWAA).
5. Match the mounting format — wall ring, guard grille, short case or long case — to the drawing before ordering; the same impeller is offered in several formats.

Where these fans are used

• Condensers, evaporators and dry coolers
• Heat-pump and chiller outdoor units
• Cooling towers and transformer cooling
• Factory and warehouse ventilation
• Tunnel and agricultural ventilation

Every figure above is measured on our own test rigs per AMCA 210 / ISO 5801 methods — see the test labs and certificates. Final selection is confirmed at the duty point and by project validation.

FAQ — Axial Fans

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