Enclosure

[Jandu]

35C is indeed very low!.... (for any Pi version ) and especially for the Pi4, and uptime of 5 weeks..     What is the usual ambient ?

I intend to configure the fan ( for the exercise) but expect not to have it operate in other than emergency mode...like when certain other members of the household use the Pi as a lay flat stack-able bookshelf....

Whilst the fan still won't fix such a situation at least the noise of it is likely to alert someone....

It is winter here in NY, so the ambient room temperature is lower than it would be in summer time, a little under 20℃ when I took the screen shot. 

I guess it also depends on the specific track sequence played, certainly a 24/192 or DSD128 album will impose a slightly heavier processing load, I've checked the temp randomly and seen it as high as 39℃.

The other reason it is running that cool is the use of a Wyred 4 Sound Recovery in between RPi 4B and the DAC, the Recovery uses no USB bus power at all, it has it's own power supply and so that too makes a significant contribution to the Pi's low operating temperature. 

Ethernet is the network connection method, and the WiFi, Bluetooth, and HDMI are all shut down.
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Does the wi-fi work inside the box? Any chance that you can give it a try? Thanks.