... I wonder if that new fan placement is better than the usual tunnel? And what are RPMs for the two fans?
I have my S15 running for 1 day. The two fans for the hashboards are more silent than the little fans in the power supply (APW8). The two fans runs between 3500-3600 and 5000-5100 rpm (21°C ambient). It seems there are two speeds for the fans at full power (1590-1600 W for 28.4 TH/s), maybe more speeds if the ambient temp rises, will see
No problem for the moment after 30 hours of mining. Slush pool returns a day average of 28.5 Th/s. That's OK with the specs.
https://imgur.com/4VUJV0h
Happy mining !