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.
- ImpellerØ250 mm9.8 in
- Max airflow5,226.75 m³/h3,074 CFM
- Max static pressure383.8 Pa1.54 in. wg
- Voltage380 V
- Speed1,360 rpm
- Input power1,380 W1.85 hp
- Noise77 dB(A)
LWFA4D250-102DS-05 AC Dual Inlet Forward Centrifugal Blower Ø250 mm
Ø250 mm | AC | Max airflow 5,226.75 m³/h | Max static pressure 383.8 Pa | 77 dB(A)
- Factory direct
- OEM / ODM
- Samples in 1–3 days
- Production 15–30 days
- 18-month warranty
- CE · RoHS · ETL on request
Need a non-standard size or another format? Ask an engineer or search the download center.
LWFA4D250-102DS-05 is a LONGWELL AC Dual Inlet Forward Centrifugal Blower from the Dual Inlet Forward Curved Blowers range, impeller Ø250 mm, rated 380 V AC, maximum airflow 5,226.75 m³/h, maximum static pressure 383.8 Pa, noise 77 dB(A), input power 1,380 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.
Technical data
| Model | LWFA4D250-102DS-05 |
|---|---|
| Series | LWFA4D250 |
| Motor type | AC |
| Phase | 3-phase |
| Rated voltage | 380 V |
| Frequency | 50 Hz |
| Current | 2.5 A |
| Input power | 1,380 W |
| Speed | 1,360 rpm |
| Max. airflow | 5,226.75 m³/h |
| Max. airflow (CFM) | 3,074 CFM |
| Max. static pressure | 383.8 Pa |
| Noise | 77 dB(A) |
| Ambient temperature | -30 ~ 60 °C |
| Storage temperature | -40 ~ 80℃ |
| Humidity | 0 ~ 85 % RH |
| Altitude | < 1000m |
| Impeller diameter | Ø250 mm |
| Rotor diameter | 102 |
| Impeller material | Galvanised sheet steel ( 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 |
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 LWFA4D250: 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 | |
|---|---|---|---|---|---|---|---|
| LWFA4D250-102DS-05 this model | 5,226.75 m³/h | 383.8 Pa | 1,360 rpm | 1,380 W | 77 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-11 | 1,185 m³/h | 773 Pa | 2,600 rpm | 185 W | 76 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 LWFA4D250 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
LWAA4D400S-5MEB-12Ø400 mm · 5,150 m³/h · ACsimilar duty
LWAA4E400S-5MEB-10Ø400 mm · 5,150 m³/h · ACsimilar duty
LWBE3G310-102NT-24Ø310 mm · 5,150 m³/h · 1,730.4 Pa · ECsimilar duty
LWFA4D315-188ST-01Ø315 mm · 5,150 m³/h · 695.25 Pa · ACsimilar duty
LWFE3G310-102PT-09Ø310 mm · 5,150 m³/h · 1,730.4 Pa · ECsimilar duty
LWAA4E450S-5MEB-14Ø450 mm · 5,150 m³/h · ACsimilar dutySee all Centrifugal Fans · select by duty point