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January 9, 2022 at 7:37 pm #29223
uRADMonitor
Keymaster

The FAN has a dual purpose:
– it pushes air through a narrow path inside the PM sensor
– it pushes air across all sensitive elements

While an open case (A3 Stevenson shield) can take advantage of the natural air convection, wind, or general air movement, the PM sensor will still need a controlled airflow.

So to make this work, the only option to lower noise is to reduce its frequency, using the sleep mode option.

On the other hand, the noise itself is ~35dB near the unit, quite low. If you have the A3 you can evaluate that yourself.