Cooling Fans for Electronics and Electronic Devices
Power supplies, LED screens, amplifiers, projectors, routers, cameras, chargers and industrial controllers all turn part of their power into heat. In a compact housing that heat has to be moved out, or components run hot and fail early. A small fan, sized for the heat load and the airflow path inside the product, is usually the simplest and most economical answer.
LONGWELL manufactures compact DC, AC and EC cooling fans and small blowers for electronics OEMs and their contract manufacturers.
Typical applications
- Power supplies, chargers and inverters
- LED video walls, digital signage and outdoor displays
- Audio amplifiers, projectors and stage equipment
- CCTV, network and telecom equipment
- Industrial controllers, test instruments and 3D printers
- Automotive and vehicle electronics
Axial fan or blower?
| Axial fan | Centrifugal blower | |
|---|---|---|
| Best for | Moving a lot of air through open housings and grilles | Pushing air through dense heat sinks, narrow channels and filters |
| Airflow / pressure | Higher airflow, lower pressure | Lower airflow, higher pressure |
| Shape | Square frame, mounts on a panel | Outlet at 90°, fits flat or slim products |
What to specify
1. Heat load and temperature limit
Know the watts to remove and the maximum allowed internal temperature. Required airflow (m³/h) ≈ 3.1 × heat (W) ÷ temperature rise (K).
2. System resistance
Grilles, filters, heat sinks and cables raise resistance. Choose the operating point on the fan curve, not the free-air figure.
3. Voltage and control
Match the product’s supply: 5, 12, 24 or 48 V DC, or 115/230 V AC. PWM or temperature-controlled speed keeps noise down at light load.
4. Monitoring
Tachometer (FG) or alarm (RD) outputs let the electronics detect a stopped fan.
5. Environment
For outdoor displays, vehicles or dusty sites, choose sealed fans (IP56 or IP68 options) and check the operating temperature range.
LONGWELL electronics cooling range
- DC axial cooling fans: frames from 25×10 mm up to 92×38 mm (larger sizes on request); 5 V (4.0–5.5), 12 V (6–13.8), 24 V (12–27.6) and 48 V (24–56) DC; brushless motors with ball bearings.
- Options: auto-restart (AS), alarm (RD), tachometer (FG), PWM speed control, temperature control, IP56 or IP68 sealing.
- AC and EC compact fans: 115 V / 230 V versions for mains-powered equipment.
- DC centrifugal blowers: mini 12 V blowers, and LWFD forward-curved DC blowers of 120, 133, 146 and 197 mm (24 / 48 / 310 V DC, 0–10 V or PWM control) for higher-pressure duties.
Browse: compact axial fans · DC cooling fans · DC forward-curved blowers
Download: DC electronics cooling fans · AC electronics cooling fans · EC electronics cooling fans
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Engineering examples
What to include in your enquiry
- Product type, heat load and temperature limit
- Space available (frame size and depth)
- Voltage, control and signal outputs
- Environment (dust, moisture, outdoor, vibration)
- The fan you use today, if replacing; annual quantity
Send your device cooling requirements →
FAQ
What size cooling fan does my device need?
Calculate the airflow from heat load and allowed temperature rise, then pick the largest frame that fits and check its curve at your system resistance. A larger fan at lower speed is usually quieter than a small fan at high speed.
What is the difference between 3-wire and 4-wire fans?
3-wire fans add a tachometer (FG) signal. 4-wire fans add a PWM input for speed control as well.
Can I get waterproof fans for outdoor LED screens?
Yes. IP56 and IP68 options are available on many DC frames. Confirm the rating for the exact model.
Can LONGWELL replace the fan in my product?
Yes. LONGWELL can provide replacement candidates for many mainstream compact fans. Send the frame size, voltage, speed or airflow, connector and signals; the final model is confirmed by duty point, mounting and a test.