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 380 V). Data version: catalogue 2026-08. 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.
Representative image of the series — dimensions and configuration of this model are given in the drawing and data table below.
- ImpellerØ250 mm9.8 in
- Max airflow1,004 m³/h591 CFM
- Max static pressure221 Pa0.89 in. wg
- Voltage380 V
- Speed1,600 rpm
- Input power60 W
- Noise70 dB(A)
LWBA4D250-092NT-20 AC Backward Curved Centrifugal Fan Ø250 mm
Ø250 mm | AC | Max airflow 1,004 m³/h | Max static pressure 221 Pa | 70 dB(A)
- Factory direct
- OEM / ODM
- Samples in 1–3 days
- Production 15–30 days
- 12-month warranty
- CE · RoHS · ETL on request
PDFDatasheet (PDF)electrical & performance dataPDFFull product catalogueAC AC Backward centrifugal fans · SKU on PDF p. 20
All files for LWBA4D250-092NT-206 files · direct download
PDFFull product catalogue · model on PDF p. 20WEBPDimensional drawingWEBPPerformance curveWEBPWiring diagramDOCXDatasheet
CAD models (STEP / DWG) are released on request — see “Engineering files” below. Another format or a non-standard variant? Ask an engineer · download center
Proven in: AHU & ventilation unit fans · CRAH FanGrid retrofit · Heat pump fan programme — all case studies on longwellfans.com
Typical applications: Air conditioning · Air handling units · FanGrid arrays · FFU / EFU — all industries
Downloads for LWBA4D250-092NT-20
PDFDatasheetPDFFull product catalogue · AC AC Backward centrifugal fans · model on PDF p. 20 · 29.3 MBDOCXDatasheet · 504 KBNeed a non-standard size or another format? Ask an engineer or search the download center.
LWBA4D250-092NT-20 is a LONGWELL AC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø250 mm, rated 380 V AC, maximum airflow 1,004 m³/h, maximum static pressure 221 Pa, noise 70 dB(A), input power 60 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.
Technical data
| Model | LWBA4D250-092NT-20 |
|---|---|
| Series | LWBA4D250 |
| Motor type | AC |
| Phase | 3-phase |
| Rated voltage | 380 V |
| Frequency | 60 Hz |
| Current | 0.15 A |
| Input power | 60 W |
| Speed | 1,600 rpm |
| Max. airflow | 1,004 m³/h |
| Max. static pressure | 221 Pa |
| Noise | 70 dB(A) |
| Ambient temperature | -40 ~ 65 °C |
| Storage temperature | -40 ~ 80℃ |
| Humidity | 0 ~ 95 % RH |
| Altitude | < 1000m |
| Impeller diameter | Ø250 mm |
| Rotor diameter | 92 mm |
| Impeller material | Galvanised sheet steel ( Impeller ) Bearing Maintenance-free deep groove ball bearings Protection Thermal protection: disconnection temperature: 150-160 °C Reset temperature: 100-130 °C Production Reference standard GB12 |
| Protection class | IP44 |
| 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 LWBA4D250: 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.
Alternatives with the same impeller (Ø250 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 | |
|---|---|---|---|---|---|---|---|
| LWBA4D250-092NT-20 this model | 1,004 m³/h | 221 Pa | 1,600 rpm | 60 W | 70 dB(A) | 380 V | |
| LWBA4D250-092NT-19 | 855 m³/h | 165 Pa | 1,450 rpm | 50 W | 68 dB(A) | 380 V | View |
| LWBA4E250-092NS-17 | 855 m³/h | 165 Pa | 1,400 rpm | 50 W | 68 dB(A) | 230 V | View |
| LWBA4E250-092NS-18 | 1,004 m³/h | 221 Pa | 1,600 rpm | 60 W | 70 dB(A) | 230 V | View |
| LWBA2E250-092NS-12 | 1,185 m³/h | 567 Pa | 2,650 rpm | 130 W | 76 dB(A) | 230 V | View |
| LWBA2D250-092NT-11 | 1,185 m³/h | 773 Pa | 2,600 rpm | 185 W | 76 dB(A) | 380 V | View |
| LWBA2D250-092NT-10 | 1,288 m³/h | 597 Pa | 2,450 rpm | 160 W | 74 dB(A) | 380 V | View |
| LWBA2D250-092NT-15 | 1,421 m³/h | 618 Pa | 2,450 rpm | 150 W | 76 dB(A) | 380 V | View |
| LWBA2E250-092NS-13 | 1,421 m³/h | 618 Pa | 2,500 rpm | 155 W | 76 dB(A) | 230 V | View |
| LWBA2D250-092NT-16 | 1,499 m³/h | 773 Pa | 2,550 rpm | 200 W | 79 dB(A) | 380 V | View |
| LWBA2E250-092NS-14 | 1,499 m³/h | 773 Pa | 2,600 rpm | 210 W | 79 dB(A) | 230 V | View |
| LWFA6E250-102NS-04 | 1,751 m³/h | 164.8 Pa | 900 rpm | 320 W | 62 dB(A) | 220 V | View |
| LWFA6D250-102NT-03 | 1,751 m³/h | 164.8 Pa | 910 rpm | 320 W | 62 dB(A) | 380 V | View |
| LWFA4D250-138NT-01 | 2,369 m³/h | 406.85 Pa | 1,400 rpm | 870 W | 72 dB(A) | 380 V | View |
| LWFA4E250-138NS-02 | 2,575 m³/h | 401.7 Pa | 1,330 rpm | 900 W | 72 dB(A) | 220 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 LWBA4D250 seriesSame impeller, different speed grade or wiring
Adjacent sizesOne size up when airflow is short, one size down when it is too much
LWBE3G270-092NS-02Ø270 mm · 1,545 m³/h · 332 Pa · ECadjacent size
LWBE3G270-092NU-01Ø270 mm · 1,545 m³/h · 332 Pa · ECadjacent size
LWBE3G225-092PS-07Ø225 mm · 1,630 m³/h · 839 Pa · ECadjacent size
LWBA2E225-092NS-01Ø225 mm · 618 m³/h · 165 Pa · ACadjacent size
LWBA2E225-092NS-10Ø225 mm · 1,257 m³/h · 695 Pa · ACadjacent size
LWBE3G225-092NS-12Ø225 mm · 1,545 m³/h · 731 Pa · ECadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
LWBA4E250-092NS-18Ø250 mm · 1,004 m³/h · 221 Pa · ACsimilar duty
LWCA-90680SN-06Ø90 mm · 1,000 m³/h · 97 Pa · ACsimilar duty
LWCA-120380SN-06Ø120 mm · 1,000 m³/h · 68 Pa · ACsimilar duty
LWCD-80720MN-06Ø80 mm · 1,000 m³/h · 82 Pa · DCsimilar duty
LWDA-180(7")S-MWN-01Ø180 mm · 1,000 m³/h · 90 Pa · ACsimilar duty
LWFA-E-200-01Ø200 mm · 1,000 m³/h · 305 Pa · ACsimilar dutySee all Backward Curved Centrifugal Fans · select by duty point