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 24 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.
Representative image of the series — dimensions and configuration of this model are given in the drawing and data table below.
- ImpellerØ250 mm9.8 in
- Max airflow1,957 m³/h1,151 CFM
- Max static pressure227 Pa0.91 in. wg
- Voltage24 V
- Speed2,780 rpm
- Input power105 W
- Noise69 dB(A)
LWAD3G250MS-7MKB-01 DC Axial Fan Ø250 mm
Ø250 mm | DC | Max airflow 1,957 m³/h | Max static pressure 227 Pa | 69 dB(A)
- Factory direct
- OEM / ODM
- Samples in 1–3 days
- Production 15–30 days
- 12-month warranty
- CE · RoHS · ETL on request
PDFDatasheet (PDF)electrical & performance dataPDFFull product catalogueDC DC Axial fans · SKU on PDF p. 7
All files for LWAD3G250MS-7MKB-016 files · direct download
PDFFull product catalogue · model on PDF p. 7WEBPDimensional drawingWEBPPerformance curveWEBPWiring diagramDOCXDatasheet
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: Heat pump fan programme · Telecom & power cabinet cooling · Cold chain supermarket retrofit · Dry-type transformer cooling — all case studies on longwellfans.com
Typical applications: Bottle coolers · Display cases · Decentralised ventilation · Drive & control cabinets — all industries
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.
Downloads for LWAD3G250MS-7MKB-01
PDFDatasheetPDFFull product catalogue · DC DC Axial fans · model on PDF p. 7 · 7.2 MBDOCXDatasheet · 763 KBNeed a non-standard size or another format? Ask an engineer or search the download center.
LWAD3G250MS-7MKB-01 is a LONGWELL DC Axial Fan from the DC Axial Fans range, impeller Ø250 mm, rated 24 V DC, maximum airflow 1,957 m³/h, maximum static pressure 227 Pa, noise 69 dB(A), input power 105 W. The low-voltage brushless DC motor suits battery-powered equipment and electronics cooling with speed control on demand.
Technical data
| Model | LWAD3G250MS-7MKB-01 |
|---|---|
| Series | LWAD3G250 |
| Motor type | DC |
| Rated voltage | 24 V |
| Frequency | 50 Hz |
| Current | 4.4 A |
| Input power | 105 W |
| Speed | 2,780 rpm |
| Max. airflow | 1,957 m³/h |
| Max. airflow (CFM) | 1,151 CFM |
| Max. static pressure | 227 Pa |
| Noise | 69 dB(A) |
| Ambient temperature | -25 ~ 60 °C |
| Storage temperature | -25 ~ 60℃ |
| Humidity | 5 ~ 90 % RH |
| Altitude | < 1000m |
| Impeller diameter | Ø250 mm |
| Impeller material | Galvanised sheet steel ( Impeller ) Cast aluminium (Housing) |
| Protection class | IP44 |
| Insulation class | B |
| 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: 4 Pulse/R; FG internal open circuit output, external pull-up resistor R, pull-up voltage V+ |
| Protection functions | Polarity Protection |
Typical applications
- Condensers, evaporators and dry coolers
- Heat-pump and chiller outdoor units
- Building and workshop ventilation
- Cooling towers and transformer cooling
Series LWAD3G250: 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 · 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 | |
|---|---|---|---|---|---|---|---|
| LWAD3G250MS-7MKB-01 this model | 1,957 m³/h | 227 Pa | 2,780 rpm | 105 W | 69 dB(A) | 24 V | |
| LWAD3G250ZB-7MKW-08 | 1,751 m³/h | 288 Pa | 3,150 rpm | 135 W | 69 dB(A) | 310 V | View |
| LWAD3G250ZS-7MKW-07 | 1,751 m³/h | 288 Pa | 3,150 rpm | 135 W | 69 dB(A) | 310 V | View |
| LWAD3G250ZS-7MEW-05 | 1,751 m³/h | 288 Pa | 3,150 rpm | 135 W | 69 dB(A) | 310 V | View |
| LWAD3G250ZB-7MEW-06 | 1,751 m³/h | 288 Pa | 3,150 rpm | 135 W | 69 dB(A) | 310 V | View |
| LWAD3G250ZS-7MNW-03 | 1,751 m³/h | 288 Pa | 3,150 rpm | 135 W | 69 dB(A) | 310 V | View |
| LWAD3G250ZB-7MNW-04 | 1,751 m³/h | 288 Pa | 3,150 rpm | 135 W | 69 dB(A) | 310 V | View |
| LWAD3G250HS-7MKB-02 | 1,957 m³/h | 227 Pa | 2,780 rpm | 105 W | 69 dB(A) | 48 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 LWAD3G250 seriesSame impeller, different speed grade or wiring
LWAD3G250HS-7MKB-02Ø250 mm · 1,957 m³/h · 227 Pa · DCsame series
LWAD3G250ZS-7MNW-03Ø250 mm · 1,751 m³/h · 288 Pa · DCsame series
LWAD3G250ZB-7MNW-04Ø250 mm · 1,751 m³/h · 288 Pa · DCsame series
LWAD3G250ZS-7MEW-05Ø250 mm · 1,751 m³/h · 288 Pa · DCsame series
LWAD3G250ZB-7MEW-06Ø250 mm · 1,751 m³/h · 288 Pa · DCsame series
LWAD3G250ZS-7MKW-07Ø250 mm · 1,751 m³/h · 288 Pa · DCsame seriesAdjacent sizesOne size up when airflow is short, one size down when it is too much
LWA-250S(T)M-04EØ240 mm · 2,700 m³/h · 300 Pa · ACadjacent size
LWMFAF265-01Ø265 mm · 2,400 m³/h · 750 Pa · ACadjacent size
LWAA2D230S-5MNW-01Ø230 mm · 1,288 m³/h · ACadjacent size
LWAA2D230S-5MNW-02Ø230 mm · 1,391 m³/h · ACadjacent size
LWEA280S(T)M-156EØ280 mm · 3,202 m³/h · 232 Pa · ACadjacent size
LWEA280S(T)M-155EØ280 mm · 1,605 m³/h · 60 Pa · ACadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
LWFE3G250-102SS-01Ø250 mm · 1,957 m³/h · 422 Pa · ECsimilar duty
LWBA4E315-102NS-04Ø315 mm · 1,957 m³/h · 412 Pa · ACsimilar duty
LWBA4E315-102NS-05Ø315 mm · 1,957 m³/h · 309 Pa · ACsimilar duty
LWBA4D315-102NT-09Ø315 mm · 1,957 m³/h · 309 Pa · ACsimilar duty
LWBA4E315-102NS-11Ø315 mm · 1,957 m³/h · 319 Pa · ACsimilar dutySee all Axial Fans · select by duty point