On July 21, 2026, LONGWELL opened a project to provide technical specifications for a 48 VDC axial fan unit, supporting a project to convert telecom tower indoor air-conditioned sites to outdoor ventilation enclosures.
Engineered fan specifications
The LONGWELL engineering team completed the technical review and output the official specification document for model LWAD3G250HS-7MKB-02-00 on July 23, 2026. The technical parameters defined in the specification are detailed below:
| Parameter | Value / Specification |
|---|---|
| Model Number | LWAD3G250HS-7MKB-02-00 |
| Nominal Voltage | 48 VDC (Voltage range: 36–57 VDC) |
| Rated Speed | 2780 rpm |
| Power Input | 105 ±10% W |
| Rated Current | 2.2 ±10% A |
| Maximum Air Flow | 1977 m³/h (1163 CFM) |
| Maximum Static Pressure | 232 Pa |
| Noise Level (LpA) | 69 dB(A) |
| Operating Temperature Range | -25°C to +60°C |
| Protection & Insulation Class | IP55 / Class B |
| Speed Control Inputs | 0–10 VDC / PWM |
| Tachometer Signal Output | 4 Pulse/R (FG internal open circuit output) |
| Impeller & Housing Material | Galvanised sheet steel impeller / Die-aluminium housing |
| Product Weight | Approx. 2.5 kg |
Documented wiring and controls
The specification documents the supply and control interfaces. Speed adjustment is supported via a 0–10 VDC voltage input or a 1–10 kHz PWM signal input with a 10%–100% duty cycle.
Discuss a similar requirement
If you require custom DC axial fan specifications for telecom cabinet ventilation or thermal management systems, submit your project requirements to LONGWELL. Please provide your required duty point (airflow and static pressure), nominal voltage, speed control signals, mounting spatial limits, and operating environment parameters.
Contact LONGWELL Engineering or visit LONGWELL Fan Selector Tool for technical support.
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Longwell manufactures 1,048 axial fans in-house. Send airflow, static pressure and voltage — an engineer replies with a matching model, performance curve and price within one working day.
