In Claymore miner for (AMD) you can set parameter (example: -tt 75").
The miner will then adjust the fan speed to try to hold the tempature stable.
This will save the fans alot, since they run as low as they need. Insted of setting a static fan speed.
You also have another parameter equal to dstm's temp-target.
Can you implement this feature/parameter for DSTM? (Refering to the -tt parameter)
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My fans speed and the noice are much lower with this feature, and your fans will last longer.
Ragefarm has proposed something similar.
I don't like the idea of software controlled fans. If the software crashes in a state where it previously set the fan to a low speed your GPU could be damaged.
Setting your fan speed to a constant value seems to be a better solution for a 24/7 running system.