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.
- ImpellerØ450 mm17.7 in
- Max airflow5,329 m³/h3,135 CFM
- Max static pressure452 Pa1.81 in. wg
- Voltage400 V
- Speed1,200 rpm
- Input power386 W
- Noise73 dB(A)
LWBE3G450-138NT-11 EC Backward Curved Centrifugal Fan Ø450 mm
Ø450 mm | EC | Max airflow 5,329 m³/h | Max static pressure 452 Pa | 73 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.
LWBE3G450-138NT-11 is a LONGWELL EC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø450 mm, rated 400 V EC, maximum airflow 5,329 m³/h, maximum static pressure 452 Pa, noise 73 dB(A), input power 386 W. The EC motor integrates the drive electronics: stepless speed control by 0–10 V or PWM signal, speed feedback and high efficiency at part load.
Technical data
| Model | LWBE3G450-138NT-11 |
|---|---|
| Series | LWBE3G450 |
| Motor type | EC |
| Phase | 3-phase |
| Rated voltage | 400 V |
| Frequency | 50 Hz |
| Input power | 386 W |
| Speed | 1,200 rpm |
| Max. airflow | 5,329 m³/h |
| Max. airflow (CFM) | 3,135 CFM |
| Max. static pressure | 452 Pa |
| Noise | 73 dB(A) |
| Ambient temperature | -25 ~ 60 °C |
| Storage temperature | -25 ~ 70℃ |
| Humidity | 0 ~ 85% RH |
| Altitude | < 1000m |
| Impeller diameter | Ø450 mm |
| Rotor diameter | 138 |
| Impeller material | Aluminum Alloy (Impeller) |
| Protection class | IP54 |
| Insulation class | F |
| Bearing | Maintenance-free deep groove ball bearings |
| Duty | S1 |
| Balance grade | G6.3 |
| Vibration standard | JB/T 8689 |
| Service life | 40,000Hours(L10). At 40℃room, humidity 15%~65%RH |
| Speed control | Control input 0~10VDC(RS485 external control box can be connected) |
| Control signal | Control signal VSP voltage range 1.5±0.1VDC~9.5±0.2VDC(During normal operation, when the VSP voltage is below 0.9±0.1VDC, the motor switches from operating mode to standby mode) |
| Speed feedback | Tach output: 15Pulse/R; FG internal open circuit output, external pull-up resistor 10K, pull-up voltage V+ |
| Auxiliary output | Output 10±0.3VDC, Max Current: 10mA |
| Communication | LWRS485-04 |
| Protection functions | Current limiting protection, Over-temperature protection, Over-current protectionLocked-rotor protection, Input power supply lacks phase protection |
| Soft start | Delay time <30 seconds to full speed |
| 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 LWBE3G450: 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 (Ø450 mm · EC)
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 | |
|---|---|---|---|---|---|---|---|
| LWBE3G450-138NT-11 this model | 5,329 m³/h | 452 Pa | 1,200 rpm | 386 W | 73 dB(A) | 400 V | |
| LWBE3G450-138PT-12 | 5,329 m³/h | 452 Pa | 1,200 rpm | 386 W | — | 400 V | View |
| LWBE3G450-138PT-13 | 7,182 m³/h | 730 Pa | 1,610 rpm | 900 W | — | 400 V | View |
| LWBE3G450-188PT-07 | 7,425 m³/h | 1,568 Pa | 2,400 rpm | 1,590 W | — | 400 V | View |
| LWBE3G450-188NT-15 | 7,425 m³/h | 1,568 Pa | 2,400 rpm | 1,590 W | 70 dB(A) | 400 V | View |
| LWFE3G450-102PS-11 | 7,467.5 m³/h | 1,030 Pa | 1,450 rpm | 700 W | 70 dB(A) | 230 V | View |
| LWBE3G450-138PT-04 | 7,828 m³/h | 824 Pa | 1,720 rpm | 910 W | 79 dB(A) | 400 V | View |
| LWBE3G450-188PT-08 | 8,019 m³/h | 1,802 Pa | 2,600 rpm | 2,060 W | — | 400 V | View |
| LWBE3G450-188NT-16 | 8,019 m³/h | 1,802 Pa | 2,600 rpm | 2,060 W | 74 dB(A) | 400 V | View |
| LWFE3G450-102PT-06 | 8,652 m³/h | 1,390.5 Pa | 1,500 rpm | 1,100 W | 85 dB(A) | 400 V | View |
| LWBE3G450-188PT-09 | 8,661 m³/h | 2,114 Pa | 2,800 rpm | 2,595 W | — | 400 V | View |
| LWBE3G450-188NT-17 | 8,661 m³/h | 2,114 Pa | 2,800 rpm | 2,595 W | 85 dB(A) | 400 V | View |
| LWBE3G450-188PT-16 | 8,985 m³/h | 840 Pa | 2,600 rpm | 2,400 W | — | 400 V | View |
| LWBE3G450-188NT-22 | 10,752 m³/h | 1,669 Pa | 2,400 rpm | 2,400 W | 92 dB(A) | 380 V | View |
| LWBE3G450-188NT-21 | 12,647 m³/h | 2,342 Pa | 2,800 rpm | 4,600 W | 96 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 LWBE3G450 seriesSame impeller, different speed grade or wiring
LWBE3G450-102NS-19Ø450 mm · 7,467.5 m³/h · 1,030 Pa · ECsame series
LWBE3G450-102NT-20Ø450 mm · 8,652 m³/h · 1,390.5 Pa · ECsame series
LWBE3G450-102NS-21Ø450 mm · 5,050 m³/h · 417 Pa · ECsame series
LWBE3G450-138NT-08Ø450 mm · 7,828 m³/h · 824 Pa · ECsame series
LWBE3G450-138NT-12Ø450 mm · 7,182 m³/h · 730 Pa · ECsame series
LWBE3G450-188NT-14Ø450 mm · 8,985 m³/h · 840 Pa · ECsame seriesAdjacent sizesOne size up when airflow is short, one size down when it is too much
LWBA4D400-138NT-10Ø400 mm · 4,120 m³/h · 494 Pa · ACadjacent size
LWBE3G500-188NT-10Ø500 mm · 13,472 m³/h · 1,541 Pa · ECadjacent size
LWBA4D400-138NT-08Ø400 mm · 4,532 m³/h · 494 Pa · ACadjacent size
LWBA4E400-138NS-09Ø400 mm · 4,120 m³/h · 494 Pa · ACadjacent size
LWBE3G500-188NT-08Ø500 mm · 14,214 m³/h · 886 Pa · ECadjacent size
LWBA4D400-138NT-11Ø400 mm · 5,082 m³/h · 504 Pa · ACadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
LWBE3G450-138PT-12Ø450 mm · 5,329 m³/h · 452 Pa · ECsimilar duty
LWBE3G355-138PT-20Ø355 mm · 5,356 m³/h · 639 Pa · ECsimilar duty
LWBE3G355-138NT-17Ø355 mm · 5,356 m³/h · 639 Pa · ECsimilar duty
LWBA6D500-138NT-03Ø500 mm · 5,356 m³/h · 361 Pa · ACsimilar duty
LWMFAF400-02Ø400 mm · 5,400 m³/h · 1,700 Pa · ACsimilar duty
LWFA4D250-102DS-05Ø250 mm · 5,226.75 m³/h · 383.8 Pa · ACsimilar dutySee all Backward Curved Centrifugal Fans · select by duty point