8 November 2025
Daegu Summer Heat and Fan Curve Choices on S19-Class Hardware
Aggressive fan curves reduce junction temperature but shorten bearing life—our depot data from July 2025.
Daegu summers push inlet temperatures above 32°C in uncooled farm spaces. Operators often crank fan profiles to factory maximum to protect hash boards. That works short-term but increases orders for FAN-7140-12V assemblies in August—our distributor callbacks show a predictable spike.
What We Logged in July 2025
Across twelve client sites we instrumented, units running 85% fan duty cycles showed 18% higher bearing noise after six weeks versus sites that improved intake filtration and kept 70% curves. Hash rate stayed within 1.2% between groups because the cleaner-intake sites reduced recirculated hot air.
Practical Steps
- Swap intake filters every three weeks during yellow dust season
- Leave 80 cm clearance behind exhaust; plywood baffles trap heat
- Stock one fan pair per ten S19-class units for August
- Log acoustic baseline monthly—a whine often precedes bearing seizure by ten days
When to Book Verification
If you changed firmware fan tables, run a hash rate verification session to confirm sustained output did not drop from excessive throttling. We compare against the revision-specific spec sheet, not generic pool averages.