Seems like at default settings it was running up too 80 and kept resetting itself for some reason after an hour or so.
I am totally not worried about the noise tbh. But imo they are louder then l3+ and it goes to 100% fan speed every 10 minutes for 10 seconds for no reason, so they can get quite noisey. The temps are what I am worried about running at 19.3.
I can get it stable at 70c on 19.3k mh/s with my warehouse open in back and front with room temp of 13, But its just not an option for me.
Why don't you set the fan speed on a fixed percentage? I use mine on 90-97% speed and besides the less stress you put on the motors it also cools the chips down by 5-10°C (the temp at least was lowered almost 10°C on my L3+)
If they are in a warehouse anyway you dont need to worry about the noise at least
I do have a warehouse, but there are people sleeping above it. I was happy at first, they have a big gate surrounding my warehouse including cameras, always people near it, but at this point, my next location will be on some industrial zone so I dont have to worry about complaints. Anyway, I tried putting it on 90% the difference was very small, so maybe I have to seriously look into get the hot air straight out using tubes or whatever. At this point I rather trade it for an L3+.