Our parts research desk tracks fan replacement orders from Korean mining operators. Between 2023 and 2025, we noticed a sharp seasonal spike in July and August — concentrated in Daegu, Gwangju, and Busan facilities without active dehumidification.
The Data
Across 340 fan replacement events logged by our clients:
- October–April: average 4.2 fan failures per 100 units per month
- May–June: average 6.1 per 100 units
- July–August: average 9.7 per 100 units
Ambient humidity above 75% was present in 82% of July-August failures. The failure mode is almost always bearing seizure — the fan stops spinning, temperature spikes within minutes, and the unit throttles or shuts down.
Replacement Costs
A genuine Antminer fan assembly costs ₩35,000–₩55,000 depending on model. Aftermarket units run ₩18,000–₩28,000 but fail 40% faster in our tracking. For a 50-unit farm, budgeting ₩2.5M annually for fan replacements in a humid Daegu warehouse is realistic.
Practical Steps
- Install hygrometers at rack level — not just at the warehouse door.
- Run dehumidifiers targeting 60% RH or below in the mining area.
- Replace fans proactively at 18 months rather than waiting for failure — a seized fan often damages the hashboard it was cooling.
- Stock two spare fans per 10 units during summer months.
We document fan condition in every on-site Power Efficiency Audit. Operators who implement dehumidification typically see fan failure rates drop to winter levels within one season.