Forward Curved Centrifugal Fan Manufacturer — EC & AC
YUYAO, CHINA · OEM / ODM · MANUFACTURER & SUPPLIER
Compare LONGWELL forward-curved centrifugal fans for compact AHUs, fan-coil equipment, heat-recovery units, appliances and other OEM ventilation systems. Filter the catalog to EC when variable-speed control and the matched electrical configuration are required.
For a matched proposal, send: airflow, static pressure, voltage and frequency, control interface, installation envelope, ambient conditions, destination and quantity.
- 1M+ company-wide annual capacity
- ISO 9001 · 14001 · 45001 systems
- Model-specific compliance documents
- Curves and drawings by model
Maximum airflow and maximum static pressure are endpoint values, not one operating point. Final selection and certification scope must be confirmed for the exact model and destination.
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 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 in the selector are digitised from each model’s published catalogue curve; wind-tunnel measured curves (AMCA 210 / ISO 5801 methods) are labelled “measured” where available — 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.