Representative image of the series — dimensions and configuration of this model are given in the drawing and data table below.
- ImpellerØ400 mm15.7 in
- Max airflow4,120 m³/h2,425 CFM
- Max static pressure494 Pa1.98 in. wg
- Voltage230 V
- Speed1,380 rpm
- Input power430 W
- Noise66 dB(A)
LWBA4E400-138NS-09 AC Backward Curved Centrifugal Fan Ø400 mm
Ø400 mm | AC | Max airflow 4,120 m³/h | Max static pressure 494 Pa | 66 dB(A)
- Direct from LONGWELL
- OEM / ODM
- Samples in 1–3 days
- Production 15–30 days
- 12-month warranty
- CE · RoHS · ETL on request
CAD models (STEP / DWG) are released on request — see “Engineering files” below. Another format or a non-standard variant? Ask an engineer · download center
CAD files exist for this model and can be released for assembly checks in SolidWorks / CATIA / Creo / Inventor.
CAD models contain the blade geometry and are not publicly downloadable. Tell us the project; an engineer sends the file after a short check, normally within 1 business day.
Performance curve (P-Q) LWBA4E400-138NS-09
Digitised from the catalogue curve at standard air (20 °C, 101.3 kPa, 1.2 kg/m³); one curve per voltage / speed grade (1 here, rated 230 V). Data version: catalogue curve re-digitised 2026-09-20 (axis-calibrated, cross-checked). The system resistance curve depends on the actual ductwork — confirm the operating point on site. Need an engineer to verify the duty point? Contact us or add the model to your RFQ and note the duty point.
Drawing & Curve LWBA4E400-138NS-09
Files for LWBA4E400-138NS-09: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.
Technical description LWBA4E400-138NS-09
LWBA4E400-138NS-09 is a LONGWELL AC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø400 mm, rated 230 V AC, maximum airflow 4,120 m³/h, maximum static pressure 494 Pa, noise 66 dB(A), input power 430 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.
Technical data
| Model | LWBA4E400-138NS-09 |
|---|---|
| Series | LWBA4E400 |
| Motor type | AC |
| Phase | 1-phase |
| Rated voltage | 230 V |
| Frequency | 50 Hz |
| Current | 1.5 A |
| Input power | 430 W |
| Speed | 1,380 rpm |
| Max. airflow | 4,120 m³/h |
| Max. static pressure | 494 Pa |
| Noise | 66 dB(A) |
| Ambient temperature | -40 ~ 65 °C |
| Impeller diameter | Ø400 mm |
| Rotor diameter | 138 mm |
| Impeller material | Aluminum Alloy |
| Protection class | IP54 |
| Insulation class | F |
| Bearing | Maintenance-free ball bearings |
| Duty | S1 |
| Rotation | Clockwise,seen on rotor |
Typical applications
- Air handling units (AHU) and rooftop units (RTU)
- Data-center CRAH / CRAC units and fan walls
- Dust extraction and process ventilation
- Fan filter units and air purifiers
Series LWBA4E400: models in the same series share the impeller and motor platform and differ in speed grade, voltage or lead-out / terminal-box configuration — compare them in the table below or ask for the best fit at your duty point.
Nameplate values: maximum airflow is measured at zero static pressure and maximum static pressure at zero airflow; the two never occur together. Confirm the operating point on the performance curve. Final selection is subject to the duty point (airflow / static pressure / voltage / control mode) and project verification.
Company certificates
Scans of original documents held by Ningbo Longwell Electric Technology Co., Ltd.: the company ISO 9001 / 14001 / 45001 management-system certificate. Click a scan to open the original.
ISO 9001 / 14001 / 45001Management systems of Ningbo Longwell Electric Technology Co., Ltd. (company certificate).
PDFISO 9001 / 14001 / 45001 management system certificateNeed a Declaration of Conformity for this model and your destination market? Ask us — we arrange additional certification on request.
How to order LWBA4E400-138NS-09
Most first orders follow the same eight steps. Quantities, terms and lead times are confirmed in your quotation.
- 1SelectFind models by duty point in the selector or by model number, compare on the curve and add them to your RFQ list.
- 2Engineering checkWithin 1 business day you receive the duty-point check on the curve, price and lead time.
- 3SamplesStock models ship in 1–3 days.
- 4Validation supportDatasheets, drawings, wiring diagrams and DoC per model; test reports, CAD and register maps after a short project check or NDA.
- 5Order & paymentProforma invoice; first orders on T/T 30 / 70.
- 6Production & release15–30 days at the partner factory that builds your model, then inspected and released to LONGWELL standards with outgoing sampling to AQL 2.5.
- 7ShippingFOB / CIF / DDP by sea from Ningbo or Shanghai; express and air on EXW / FCA / DAP.
- 8After-sales12 months standard, extendable to 18–24 months by project agreement; test records retained for 5 years; 8D closed-loop for any issue; annual technical review for framework customers.
Test & release at LONGWELL
Specified and drawn by LONGWELL; built to LONGWELL drawings by qualified partner factories; inspected and released to LONGWELL standards before shipment.
See test and release photos (8)
Alternatives with the same impeller (Ø400 mm · AC)
Same impeller, different speed grade, power or wiring. Step up for more airflow, step down for lower noise.
| Model | Max airflow | Max static pressure | Speed | Power | Noise | Voltage | |
|---|---|---|---|---|---|---|---|
| LWBA4E400-138NS-09 this model | 4,120 m³/h | 494 Pa | 1,380 rpm | 430 W | 66 dB(A) | 230 V | |
| LWBA6E400-102NS-05 | 2,163 m³/h | 216 Pa | 940 rpm | 135 W | 56 dB(A) | 230 V | View |
| LWBA6E400-102NS-06 | 2,421 m³/h | 278 Pa | 1,050 rpm | 155 W | 57 dB(A) | 230 V | View |
| LWBA4D400-102NT-03 | 2,936 m³/h | 464 Pa | 1,380 rpm | 265 W | 64 dB(A) | 380 V | View |
| LWBA4E400-102NS-01 | 2,936 m³/h | 464 Pa | 1,350 rpm | 260 W | 64 dB(A) | 230 V | View |
| LWBA4D400-102NT-04 | 3,090 m³/h | 515 Pa | 1,460 rpm | 320 W | 68 dB(A) | 380 V | View |
| LWBA4E400-102NS-02 | 3,090 m³/h | 515 Pa | 1,450 rpm | 330 W | 68 dB(A) | 230 V | View |
| LWBA4D400-138NT-10 | 4,120 m³/h | 494 Pa | 1,380 rpm | 440 W | 66 dB(A) | 380 V | View |
| LWBA4D400-138NT-08 | 4,532 m³/h | 494 Pa | 1,370 rpm | 550 W | 69 dB(A) | 380 V | View |
| LWBA4E400-138NS-07 | 4,532 m³/h | 494 Pa | 1,380 rpm | 550 W | 69 dB(A) | 230 V | View |
| LWBA4D400-138NT-11 | 5,082 m³/h | 504 Pa | 1,400 rpm | 484 W | 72 dB(A) | 380 V | View |
| LWFA8D400-188NT-03 | 5,974 m³/h | 345.05 Pa | 700 rpm | 1,700 W | 65 dB(A) | 380 V | View |
| LWFA4D400-188NT-01 | 6,695 m³/h | 1,030 Pa | 1,400 rpm | 4,800 W | 82 dB(A) | 380 V | View |
| LWFA6D400-188NT-02 | 7,313 m³/h | 540.75 Pa | 870 rpm | 2,800 W | 74 dB(A) | 380 V | View |
Not sure which one? Send us the duty point (airflow / static pressure / noise limit) — use the selector or ask an engineer.
Other models in the LWBA4E400 seriesSame impeller, different speed grade or wiring
Adjacent sizesOne size up when airflow is short, one size down when it is too much
LWBE3G355-092PS-15Ø355 mm · 2,472 m³/h · 350 Pa · ECadjacent size
LWBE3G355-102PS-18Ø355 mm · 3,915 m³/h · 770 Pa · ECadjacent size
LWBE3G355-102PS-17Ø355 mm · 3,142 m³/h · 670 Pa · ECadjacent size
LWBE3G355-102PS-16Ø355 mm · 3,554 m³/h · 618 Pa · ECadjacent size
LWBE3G355-138PT-05Ø355 mm · 7,045 m³/h · 830 Pa · ECadjacent size
LWBE3G355-102NS-15Ø355 mm · 3,915 m³/h · 770 Pa · ECadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
LWBA2D315-188NT-17Ø315 mm · 4,120 m³/h · 1,082 Pa · ACsimilar duty
LWBA4D400-138NT-10Ø400 mm · 4,120 m³/h · 494 Pa · ACsimilar duty
LWBE3G310-102NS-09Ø310 mm · 4,120 m³/h · 1,081.5 Pa · ECsimilar duty
LWDD10-10-ECØ254 mm · 4,102 m³/h · 608 Pa · ECsimilar duty
LWT-1125-014,100 m³/h · 1,700 Pa · ACsimilar duty
LWT-1125-024,100 m³/h · 1,700 Pa · ACsimilar dutySee all Backward Curved Centrifugal Fans · select by duty point
Go deeper on longwellfans.com
Application guides, project stories and engineering calculators for centrifugal fans — on our main site.
Solutions
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