Digitised from the catalogue curve at standard air (20 °C, 101.3 kPa, 1.2 kg/m³); one curve per voltage / speed grade. 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.
- ImpellerØ400 mm15.7 in
- Max airflow5,082 m³/h2,989 CFM
- Max static pressure504 Pa2.02 in. wg
- Voltage380 V
- Speed1,400 rpm
- Input power484 W
- Noise72 dB(A)
LWBA4D400-138NT-11 AC Backward Curved Centrifugal Fan Ø400 mm
Ø400 mm | AC | Max airflow 5,082 m³/h | Max static pressure 504 Pa | 72 dB(A)
- Factory direct
- OEM / ODM
- Samples in 1–3 days
- Production 15–30 days
- 18-month warranty
- CE · RoHS · ETL on request
Engineering files (on request)
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 downloadable. Tell us the project; an engineer sends the file after a short check, normally within 1 business day.
Need a non-standard size or another format? Ask an engineer or search the download center.
LWBA4D400-138NT-11 is a LONGWELL AC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø400 mm, rated 380 V AC, maximum airflow 5,082 m³/h, maximum static pressure 504 Pa, noise 72 dB(A), input power 484 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.
Technical data
| Model | LWBA4D400-138NT-11 |
|---|---|
| Series | LWBA4D400 |
| Motor type | AC |
| Phase | 3-phase |
| Rated voltage | 380 V |
| Frequency | 50 Hz |
| Current | 1.27 A |
| Input power | 484 W |
| Speed | 1,400 rpm |
| Max. airflow | 5,082 m³/h |
| Max. airflow (CFM) | 2,989 CFM |
| Max. static pressure | 504 Pa |
| Noise | 72 dB(A) |
| Ambient temperature | -30 ~ 60 °C |
| Storage temperature | -40 ~ 80℃ |
| Humidity | 0 ~ 85 % RH |
| Altitude | < 1000m |
| Impeller diameter | Ø400 mm |
| Rotor diameter | 138 |
| Impeller material | Aluminum Alloy ( Impeller ) |
| Protection class | IP54 |
| Insulation class | F |
| Bearing | Maintenance-free ball bearings |
| Duty | S1 |
| Balance grade | G6.3 |
| Vibration standard | JB/T 8689 |
| Service life | 30,000Hours(L10), At 40 °Croom, humidity 15%~65%RH |
| 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 LWBA4D400: 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 (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 | |
|---|---|---|---|---|---|---|---|
| LWBA4D400-138NT-11 this model | 5,082 m³/h | 504 Pa | 1,400 rpm | 484 W | 72 dB(A) | 380 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 |
| LWBA4E400-138NS-09 | 4,120 m³/h | 494 Pa | 1,380 rpm | 430 W | 66 dB(A) | 230 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 |
| 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.
Related products
Other models in the LWBA4D400 seriesSame impeller, different speed grade or wiring
Adjacent sizesOne size up when airflow is short, one size down when it is too much
LWBE3G355-102NS-21Ø355 mm · 3,141.5 m³/h · 669.5 Pa · ECadjacent size
LWFE3G355-102PT-10Ø355 mm · 6,180 m³/h · 1,751 Pa · ECadjacent size
LWBE3G355-092NS-19Ø355 mm · 2,472 m³/h · 350.2 Pa · ECadjacent size
LWBE3G355-102NS-20Ø355 mm · 3,554 m³/h · 618 Pa · ECadjacent size
LWBE3G355-092PS-15Ø355 mm · 2,472 m³/h · 350 Pa · ECadjacent size
LWBD3G355-102NH-04Ø355 mm · 2,421 m³/h · 499 Pa · DCadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
LWMFAF400-01Ø400 mm · 5,100 m³/h · 1,390 Pa · ACsimilar duty
LWFA-E-400-02Ø400 mm · 5,100 m³/h · 610 Pa · ACsimilar duty
LWBE3G450-102NS-21Ø450 mm · 5,050 m³/h · 417 Pa · ECsimilar duty
LWBE3G355-102NS-11Ø355 mm · 5,047 m³/h · 1,009.4 Pa · ECsimilar duty
LWFE3G355-102PS-03Ø355 mm · 5,047 m³/h · 1,009.4 Pa · ECsimilar duty
LWAA4D400S-5MEB-12Ø400 mm · 5,150 m³/h · ACsimilar dutySee all Backward Curved Centrifugal Fans · select by duty point