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.
- ImpellerØ175 mm6.9 in
- Max airflow670 m³/h394 CFM
- Max static pressure319 Pa1.28 in. wg
- Voltage24 V
- Speed2,800 rpm
- Input power50 W
- Noise68 dB(A)
LWBD3G175-072NM-04 DC Backward Curved Centrifugal Fan Ø175 mm
Ø175 mm | DC | Max airflow 670 m³/h | Max static pressure 319 Pa | 68 dB(A)
- Factory direct
- OEM / ODM
- Samples in 1–3 days
- Production 15–30 days
- 18-month warranty
- CE · ETL · RoHS
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.
LWBD3G175-072NM-04 is a LONGWELL DC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø175 mm, rated 24 V DC, maximum airflow 670 m³/h, maximum static pressure 319 Pa, noise 68 dB(A), input power 50 W. The low-voltage brushless DC motor suits battery-powered equipment and electronics cooling with speed control on demand.
Technical data
| Model | LWBD3G175-072NM-04 |
|---|---|
| Series | LWBD3G175 |
| Motor type | DC |
| Rated voltage | 24 V |
| Current | 2.1 A |
| Input power | 50 W |
| Speed | 2,800 rpm |
| Max. airflow | 670 m³/h |
| Max. airflow (CFM) | 394 CFM |
| Max. static pressure | 319 Pa |
| Noise | 68 dB(A) |
| Ambient temperature | -25 ~ 60 °C |
| Storage temperature | -25 ~ 60℃ |
| Humidity | 5 ~ 90 % RH |
| Altitude | < 1000m |
| Impeller diameter | Ø175 mm |
| Rotor diameter | 72 |
| Impeller material | PA6+GF( Impeller ) |
| Protection class | IP42 |
| 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 25 °Croom, humidity 15%~65%RH |
| Speed control | Control input 0~10VDC/PWM |
| Control signal | Control signal VSP voltage range1VDC~10VDC(During normal operation, when the VSP voltage is below 1.2VDC, the motor switches from operating mode to standby mode) |
| PWM input | PWM signal: frequency 1K–10KHz, amplitude 10V,duty cycle 10%–100% . |
| Speed feedback | Tach output: 2 Pulse/R; FG internal open circuit output, external pull-up resistor R, pull-up voltage V+ |
| Protection functions | Polarity Protection |
| 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 LWBD3G175: 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 (Ø175 mm · DC)
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 | |
|---|---|---|---|---|---|---|---|
| LWBD3G175-072NM-04 this model | 670 m³/h | 319 Pa | 2,800 rpm | 50 W | 68 dB(A) | 24 V | |
| LWBD3G175-072NH-03 | 618 m³/h | 515 Pa | 3,900 rpm | 75 W | 71 dB(A) | 48 V | View |
| LWBD3G175-072NM-02 | 618 m³/h | 515 Pa | 3,900 rpm | 75 W | 71 dB(A) | 24 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 LWBD3G175 seriesSame impeller, different speed grade or wiring
Adjacent sizesOne size up when airflow is short, one size down when it is too much
LWFE3G180-092SS-02Ø180 mm · 927 m³/h · 824 Pa · ECadjacent size
LWBA2E180-092NS-01Ø180 mm · 443 m³/h · 335 Pa · ACadjacent size
LWBA2E180-092NS-02Ø180 mm · 494 m³/h · 371 Pa · ACadjacent size
LWBA2E180-092NS-03Ø180 mm · 443 m³/h · 335 Pa · ACadjacent size
LWFE3G180-102DS-01Ø180 mm · 2,060 m³/h · 742 Pa · ECadjacent size
LWFE3G180-092DS-02Ø180 mm · 1,730 m³/h · 247 Pa · ECadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
LWAA2D185S-7MNW-03Ø185 mm · 670 m³/h · ACsimilar duty
LWAA2E185S-7MNW-01Ø185 mm · 670 m³/h · ACsimilar duty
LWFE3G160-072SS-07Ø160 mm · 670 m³/h · 979 Pa · ECsimilar duty
LWFE3G160-092SS-02Ø160 mm · 666 m³/h · 773 Pa · ECsimilar duty
LWDA-150(6")U-PWN-13Ø150 mm · 674 m³/h · 355 Pa · ACsimilar duty
LWDD-160M-MBN-02Ø160 mm · 662 m³/h · 505 Pa · DCsimilar dutySee all Backward Curved Centrifugal Fans · select by duty point