Forward Curved Centrifugal Fans
Forward curved (multi-vane) impellers move more air at the same outer diameter in a compact envelope, ideal for space-constrained equipment integration; available single inlet with housing, dual inlet and free-running. Final selection is confirmed at the duty point (airflow / static pressure / voltage / control mode) and by project verification.
Browse by series
| Model | Size | Max airflowm³/h | Max static pressurePa | PowerW | NoisedB(A) | Speedrpm | VoltageV | ||
|---|---|---|---|---|---|---|---|---|---|
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LWFA2E108-072NS-01AC | Ø108 mm | 155 | 185.4 | 30 | 53 | 2,550 | 230 | Details |
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LWFA2E120-092NS-01AC | Ø120 mm | 206 | 278 | 50 | 51 | 2,550 | 230 | Details |
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LWFA2E120-092NS-02AC | Ø120 mm | 216 | 391 | 63 | 53 | 2,800 | 230 | Details |
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LWFA2E133-092NS-01AC | Ø133 mm | 299 | 361 | 83 | 61 | 2,300 | 230 | Details |
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LWFA2E133-092NS-02AC | Ø133 mm | 278 | 464 | 95 | 63 | 2,350 | 230 | Details |
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LWFA2E140-092NS-01AC | Ø140 mm | 335 | 330 | 100 | 52 | 1,600 | 230 | Details |
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LWFA2E140-092NS-02AC | Ø140 mm | 314 | 484 | 110 | 58 | 1,500 | 230 | Details |
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LWFA2E140-092NS-03AC | Ø140 mm | 340 | 371 | 100 | 52 | 1,600 | 230 | Details |
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LWFA2E150-092NS-01AC | Ø150 mm | 551 | 464 | 135 | 67 | 2,600 | 230 | Details |
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LWFA2E150-092NS-02AC | Ø150 mm | 500 | 649 | 180 | 71 | 2,850 | 230 | Details |
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LWFA2E160-092NS-01AC | Ø160 mm | 525 | 556.2 | 230 | 69 | 1,800 | 230 | Details |
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LWFA4D200-102NT-01AC | Ø200 mm | 1,236 | 226.6 | 330 | 59 | 1,270 | 380 | Details |
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LWFA4D225-138NT-01AC | Ø225 mm | 1,648 | 288.4 | 490 | 65 | 1,300 | 380 | Details |
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LWFA4D250-138NT-01AC | Ø250 mm | 2,369 | 406.85 | 870 | 72 | 1,400 | 380 | Details |
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LWFA4D280-188NT-01AC | Ø280 mm | 3,502 | 463.5 | 1,700 | 77 | 1,360 | 380 | Details |
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LWFA4D315-188NT-01AC | Ø315 mm | 4,328 | 576.8 | 2,200 | 80 | 1,360 | 380 | Details |
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LWFA4D355-188NT-01AC | Ø355 mm | 5,665 | 906.4 | 3,500 | 80 | 1,340 | 380 | Details |
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LWFA4D400-188NT-01AC | Ø400 mm | 6,695 | 1,030 | 4,800 | 82 | 1,400 | 380 | Details |
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LWFA4E160-092NS-02AC | Ø160 mm | 412 | 154.5 | 68 | 58 | 1,400 | 230 | Details |
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LWFA4E180-092NS-01AC | Ø180 mm | 773 | 195.7 | 85 | 69 | 1,450 | 230 | Details |
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LWFA4E200-102NS-02AC | Ø200 mm | 1,236 | 226.6 | 330 | 59 | 1,280 | 230 | Details |
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LWFA4E225-138NS-02AC | Ø225 mm | 1,761 | 288.4 | 510 | 65 | 1,320 | 230 | Details |
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LWFA4E250-138NS-02AC | Ø250 mm | 2,575 | 401.7 | 900 | 72 | 1,330 | 220 | Details |
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LWFA4E280-188NS-02AC | Ø280 mm | 2,284 | 391.4 | 1,600 | 77 | 1,360 | 220 | Details |
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LWFA4E315-188NS-02AC | Ø315 mm | 4,429 | 618 | 2,300 | 80 | 1,360 | 220 | Details |
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LWFA6D225-138NT-03AC | Ø225 mm | 1,339 | 236.9 | 300 | 59 | 930 | 380 | Details |
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LWFA6D250-102NT-03AC | Ø250 mm | 1,751 | 164.8 | 320 | 62 | 910 | 380 | Details |
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LWFA6D280-138NT-03AC | Ø280 mm | 2,318 | 247.2 | 450 | 65 | 900 | 380 | Details |
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LWFA6D315-138NT-03AC | Ø315 mm | 2,987 | 249.26 | 780 | 68 | 940 | 380 | Details |
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LWFA6D355-188NT-02AC | Ø355 mm | 4,172 | 412 | 1,150 | 70 | 900 | 380 | Details |
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LWFA6D400-188NT-02AC | Ø400 mm | 7,313 | 540.75 | 2,800 | 74 | 870 | 380 | Details |
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LWFA6D450-188NT-01AC | Ø450 mm | 7,725 | 638.6 | 3,500 | 74 | 930 | 380 | Details |
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LWFA6D500-188NT-01AC | Ø500 mm | 9,064 | 916.7 | 4,400 | 75 | 900 | 380 | Details |
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LWFA6E250-102NS-04AC | Ø250 mm | 1,751 | 164.8 | 320 | 62 | 900 | 220 | Details |
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LWFA6E280-138NS-04AC | Ø280 mm | 2,318 | 247.2 | 450 | 65 | 900 | 220 | Details |
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LWFA6E315-138NS-04AC | Ø315 mm | 3,605 | 249.26 | 720 | 68 | 870 | 220 | Details |
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LWFA8D400-188NT-03AC | Ø400 mm | 5,974 | 345.05 | 1,700 | 65 | 700 | 380 | Details |
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LWFA8D450-188NT-02AC | Ø450 mm | 7,416 | 370.8 | 2,000 | 68 | 680 | 380 | Details |
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LWFE3G108-072NS-01EC | Ø108 mm | 330 | 330 | 82 | 57 | 3,340 | 230 | Details |
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LWFE3G120-072NS-01EC | Ø120 mm | 350 | 412 | 90 | 67 | 3,230 | 230 | Details |
Forward Curved Centrifugal Fans — selection guide
Forward Curved Centrifugal Fans: 46 models, impellers Ø108–500 mm, maximum airflow 155–9,064 m³/h, static pressure to 1,030 Pa, AC and EC motors, across 38 series. 15 of them carry a measured P-Q curve and 46 a dimensional drawing.
Forward curved centrifugal fans are the free-running and housed multi-vane impellers used where space is tight: Ø108 to Ø500 mm, LWFA2E / LWFA4E AC and LWFE3G EC in the compact Ø108–200 mm sizes, and LWFA4D / 6D / 8D three-phase units with rotor 138 / 188 in the Ø225–500 mm sizes for packaged units and ovens. Airflow 155 to 9,064 m³/h at up to 1,030 Pa.
Compared with a backward curved impeller of the same diameter a forward curved impeller moves 30–50% more air at low pressure in a smaller housing, which is why it survives in fan coil units, compact AHUs and process equipment despite lower efficiency.
How to select from this range
- Choose forward curved when the envelope is fixed and the pressure is below about 300–500 Pa.
- The power curve rises with airflow: size the motor for the lowest resistance the system can see.
- Large sizes (Ø225–500 mm) are three-phase 380 V; compact sizes 230 V.
Where these fans are used
- Compact air conditioners and fan coil units
- Ovens, dryers and process heaters
- Packaged ventilation units
Curves marked “measured” come from our own test rigs per AMCA 210 / ISO 5801 methods; digitised catalogue curves are flagged as such in the selector — see the test labs and certificates. Final selection is confirmed at the duty point and by project validation.
FAQ — Forward Curved Centrifugal Fans
When is a forward curved fan the better choice?
When the housing depth is fixed and the pressure is low: at Ø200 mm a forward curved fan moves more air than a Ø250 mm backward curved fan at 200 Pa. Above about 500 Pa the backward curved fan wins on efficiency and stability.
Which forward curved sizes are three-phase?
Ø225 to Ø500 mm (LWFA4D / 6D / 8D, 16 models on 380 V); the Ø108–200 mm sizes are 230 V single-phase.