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Fans
PWM Fan
The PWM fan in the Pironman 5 is managed by the Raspberry Pi system and forms the cornerstone of its smart cooling solution, especially under heavy loads. This system combines a primary PWM fan with two supplementary RGB fans for enhanced cooling performance, closely integrated with the Raspberry Pi 5’s thermal management system.

Electrical Characteristics
Rated Voltage: 5 VDC
Starting Voltage: 4.0 V (at 25°C Power ON/OFF)
Operating Voltage Range: 4.0 ~ 5.5 VDC
Rated Current: 0.05 A / MAX. 0.08 A
Rated Power: 0.25 W / MAX. 0.40 W
Rated Speed: 3500±10% RPM (at 25°C, tested after 3 minutes of operation)
Maximum Airflow: 2.46 (MIN. 2.21) CFM (at zero static pressure)
Maximum Static Pressure: 0.62 (MIN. 0.496) mmH2O (at zero airflow)
Acoustical Noise: 22.31 dB(A) MAX. 25.31 dB(A)
Life Expectancy: 40,000 hours (at 25°C, 65% humidity, normal room conditions)
Mechanical Characteristics
Dimensions: 40x10.4x40 mm (LxWxH)
Frame Material: PBT Plastic
Impeller Material: PBT Plastic
Bearing Type: Hydraulic Bearing
Environmental Parameters
Operating Temperature: -10°C ~ 70°C
Storage Temperature: -40°C ~ 75°C
Operating Humidity: 5% ~ 90% RH
Storage Humidity: 5% ~ 95% RH
Fan Speed Control Based on Temperature
The PWM fan operates dynamically, adjusting its speed according to the Raspberry Pi 5’s temperature:
Below 50°C: Fan remains off (0% speed).
At 50°C: Fan operates at low speed (30% speed).
At 60°C: Fan increases to medium speed (50% speed).
At 67.5°C: Fan ramps up to high speed (70% speed).
At 75°C and above: Fan operates at full speed (100% speed).
This temperature-to-speed control includes a 5°C hysteresis to prevent frequent speed changes. For instance, the fan will reduce its speed only after the temperature drops 5°C below each threshold.
The following commands allow users to monitor the PWM fan’s operation:
To check the fan’s current state:
cat /sys/class/thermal/cooling_device0/cur_state
RGB Fans

Extermal dimension: 40*40*10MM
Weight: 13.5±5g/pcs
Life: 40,000 hours (room temperature 25°C)
Maximum Air Flow: 2.46CFM
Max.Air Pressure: 0.62mm-H2O
Accoustic Sound: 22.31dBA
Rated Input power: 5V/0.1A
Rated Speed: 3500±10%RPM
Operating Temperature: -10℃~+70℃
Storage Temperature: -30℃~+85℃