We have what we call "Enhancement requests" you can create with your account teams.
I am not sure if it covers parameters, like the fan being loud, but it's worth finding out from your account team.
The 240 though is an EOL product, so enhancements will no longer happen on this product.
In terms of other SRX models that are seemingly quiet, I would once again suggest that you reach out to your Sales/account teams, who can guide you with this purchase.
Hope that helps.
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Have you ventured into investigating this from a more, troubleshooting point of view?
Meaning, do you see any logs in chassisd or alarms indicating that the FANs are infact now at intermediate speeds or at higher speeds, etc ?
Also, 'show chassis temperature-thresholds' will show you the expected Fan behavior over a range of temperatures. And 'show chassis environment' will cover the present/current temperature situation on your chassis.
Perhaps finding out if the Fan is behaving as expected, would be a place to start?
The Fans are running based on the tempurature. What are the traffic load on two devices, more traffic load will definitely bring up CPU tempurature and activate the FANs. The two junos version you mentioned are end of life already. Not sure if you put the always running fan device under a cooler environment could stop it running. If HW are all the same and the version matters, you may downgrade it to the quiet version for testing purposes. But juniper does not recommend customers to downgrade the software.
For newer platforms, ususally the smaller model is quiet. So far the SRX300 series are the smaller branch platforms. I feel the SRX300 might be quiet in Fans from the device picture.
I used to have a SRX240 runs on my desk, the fan will be noisy once it is activated. So I switched to a SRX210 (end of life too) afterwards, it is pretty quiet. From the output, i would say there should be no problems with the fans as they are running in a normal speed.
One more thing i would remind you, the device has air filters, if it has been running for a long time, clean the air fitler/dust might help in reducing the fan spinning chance.
yes, the fan speed is automatically driven by the temperature detected inside the SRX. So it is normal so to speak.
You don't need to configure anything for the fan behavior to work. This is built in to protect the hardware from overheating. When the internal temp gets too high the fans start. If it gets really high the fans kick in faster/louder. And it adjusts automatically with internal temp.