Representative image of the series — dimensions and configuration of this model are given in the drawing and data table below.
- ImpellerØ450 mm17.7 in
- Max airflow6,077 m³/h3,577 CFM
- Max static pressure618 Pa2.48 in. wg
- Voltage230 V
- Speed1,350 rpm
- Input power800 W1.07 hp
- Noise76 dB(A)
LWBA4E450-138NS-02 AC Backward Curved Centrifugal Fan Ø450 mm
Ø450 mm | AC | Max airflow 6,077 m³/h | Max static pressure 618 Pa | 76 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
Performance curve (P-Q) LWBA4E450-138NS-02
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 & Wiring LWBA4E450-138NS-02
Files for LWBA4E450-138NS-02: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.
Technical description LWBA4E450-138NS-02
LWBA4E450-138NS-02 is a LONGWELL AC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø450 mm, rated 230 V AC, maximum airflow 6,077 m³/h, maximum static pressure 618 Pa, noise 76 dB(A), input power 800 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.
Technical data
| Model | LWBA4E450-138NS-02 |
|---|---|
| Series | LWBA4E450 |
| Motor type | AC |
| Phase | 1-phase |
| Rated voltage | 230 V |
| Frequency | 50 Hz |
| Current | 3.5 A |
| Input power | 800 W |
| Speed | 1,350 rpm |
| Max. airflow | 6,077 m³/h |
| Max. static pressure | 618 Pa |
| Noise | 76 dB(A) |
| Ambient temperature | -40 ~ 65 °C |
| Storage temperature | -40 ~ 80℃ |
| Humidity | 0 ~ 85 % RH |
| Altitude | < 1000m |
| Impeller diameter | Ø450 mm |
| Rotor diameter | 138 mm |
| Impeller material | Aluminum Alloy |
| Protection class | IP54 |
| Insulation class | F |
| Bearing | Maintenance-free ball bearings |
| Duty | S1 |
| Vibration standard | JB/T 8689 |
| Service life | 30,000Hours(L10), At 40 °Croom, humidity 15%~65%RH. Balancing According to JB/T 9101-1999 requirements G6.3 Vibration of the fan Test method accord with JB/T 8689 Installation method Horizontal or vertical installation Mate |
| 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 LWBA4E450: 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 LWBA4E450-138NS-02
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 (Ø450 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 | |
|---|---|---|---|---|---|---|---|
| LWBA4E450-138NS-02 this model | 6,077 m³/h | 618 Pa | 1,350 rpm | 800 W | 76 dB(A) | 230 V | |
| LWBA6D450-138NT-07 | 4,017 m³/h | 309 Pa | 920 rpm | 300 W | 60 dB(A) | 380 V | View |
| LWBA6E450-138NS-05 | 4,017 m³/h | 309 Pa | 930 rpm | 260 W | 60 dB(A) | 230 V | View |
| LWBA4D450-138NT-08 | 4,450 m³/h | 381 Pa | 1,050 rpm | 360 W | 61 dB(A) | 380 V | View |
| LWBA6E450-138NS-06 | 4,450 m³/h | 381 Pa | 1,050 rpm | 350 W | 61 dB(A) | 230 V | View |
| LWBA4D450-138NT-01 | 6,077 m³/h | 618 Pa | 1,350 rpm | 800 W | 76 dB(A) | 380 V | View |
| LWBA4D450-138NT-09 | 6,164 m³/h | 630 Pa | 1,395 rpm | 616 W | 78.8 dB(A) | 380 V | View |
| LWBA4D450-188NT-03 | 6,695 m³/h | 618 Pa | 1,350 rpm | 800 W | 79 dB(A) | 380 V | View |
| LWBA4D450-188NT-04 | 7,210 m³/h | 695 Pa | 1,400 rpm | 1,100 W | 82 dB(A) | 380 V | View |
| LWFA8D450-188NT-02 | 7,416 m³/h | 370.8 Pa | 680 rpm | 2,000 W | 68 dB(A) | 380 V | View |
| LWFA6D450-188NT-01 | 7,725 m³/h | 638.6 Pa | 930 rpm | 3,500 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.
Adjacent sizesOne size up when airflow is short, one size down when it is too much
LWBA6E400-102NS-06Ø400 mm · 2,421 m³/h · 278 Pa · ACadjacent size
LWBA4D400-102NT-04Ø400 mm · 3,090 m³/h · 515 Pa · ACadjacent size
LWBA6E400-102NS-05Ø400 mm · 2,163 m³/h · 216 Pa · ACadjacent size
LWBA4D400-102NT-03Ø400 mm · 2,936 m³/h · 464 Pa · ACadjacent size
LWBA4E400-138NS-07Ø400 mm · 4,532 m³/h · 494 Pa · ACadjacent size
LWBA4D400-138NT-08Ø400 mm · 4,532 m³/h · 494 Pa · ACadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
LWBA4D450-138NT-01Ø450 mm · 6,077 m³/h · 618 Pa · ACsimilar duty
LWPVD-500(20")S-016,000 m³/hsimilar duty
LWBA4D450-138NT-09Ø450 mm · 6,164 m³/h · 630 Pa · ACsimilar dutyLWWAF-5A-0.25-4P-1-0016,170 m³/h · ACsimilar duty
LWAA4D420S-5MEB-04Ø420 mm · 5,974 m³/h · ACsimilar duty
LWBA2D355-188NT-18Ø355 mm · 5,974 m³/h · 1,339 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.
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