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.
- ImpellerØ250 mm9.8 in
- Max airflow1,185 m³/h697 CFM
- Max static pressure773 Pa3.10 in. wg
- Voltage380 V
- Speed2,600 rpm
- Input power185 W
- Noise76 dB(A)
LWBA2D250-092NT-11 AC Backward Curved Centrifugal Fan Ø250 mm
Ø250 mm | AC | Max airflow 1,185 m³/h | Max static pressure 773 Pa | 76 dB(A)
- Factory direct
- OEM / ODM
- Samples in 1–3 days
- Production 15–30 days
- 12-month warranty
- CE · RoHS · ETL on request
All files for LWBA2D250-092NT-112 files · direct download
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 LWBA2D250-092NT-11
PDFDatasheet · 1.9 MBNeed a non-standard size or another format? Ask an engineer or search the download center.
LWBA2D250-092NT-11 is a LONGWELL AC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø250 mm, rated 380 V AC, maximum airflow 1,185 m³/h, maximum static pressure 773 Pa, noise 76 dB(A), input power 185 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.
Technical data
| Model | LWBA2D250-092NT-11 |
|---|---|
| Series | LWBA2D250 |
| Motor type | AC |
| Phase | 3-phase |
| Rated voltage | 380 V |
| Frequency | 60 Hz |
| Current | 0.38 A |
| Input power | 185 W |
| Speed | 2,600 rpm |
| Max. airflow | 1,185 m³/h |
| Max. static pressure | 773 Pa |
| Noise | 76 dB(A) |
| Ambient temperature | -40 ~ 65 °C |
| Impeller diameter | Ø250 mm |
| Rotor diameter | 92 mm |
| Impeller material | Plastic PA66 |
| Protection class | IP44 |
| 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 LWBA2D250: 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 | |
|---|---|---|---|---|---|---|---|
| LWBA2D250-092NT-11 this model | 1,185 m³/h | 773 Pa | 2,600 rpm | 185 W | 76 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 |
| LWBA4D250-092NT-20 | 1,004 m³/h | 221 Pa | 1,600 rpm | 60 W | 70 dB(A) | 380 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-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 LWBA2D250 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
LWBA2E225-092NS-01Ø225 mm · 618 m³/h · 165 Pa · ACadjacent size
LWFA4D225-138ST-02Ø225 mm · 1,442 m³/h · 288.4 Pa · ACadjacent size
LWBA4E225-092NS-02Ø225 mm · 690 m³/h · 216 Pa · ACadjacent size
LWFA4D225-138NT-01Ø225 mm · 1,648 m³/h · 288.4 Pa · ACadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
LWBA2E250-092NS-09Ø250 mm · 1,185 m³/h · 773 Pa · ACsimilar duty
LWBA2E250-092NS-12Ø250 mm · 1,185 m³/h · 567 Pa · ACsimilar duty
LWBE3G220-072NS-08Ø220 mm · 1,184.5 m³/h · 978.5 Pa · ECsimilar duty
LWBE3G220-072NU-12Ø220 mm · 1,184.5 m³/h · 978.5 Pa · ECsimilar duty
LWBE3G225-072NS-13Ø225 mm · 1,184.5 m³/h · 669.5 Pa · ECsimilar duty
LWBE3G225-072NU-15Ø225 mm · 1,184.5 m³/h · 669.5 Pa · ECsimilar dutySee all Backward Curved Centrifugal Fans · select by duty point