When Intake Filters Kill Your Hash Rate

Most operators check pool statistics daily but inspect physical hardware monthly, if at all. In our field assessments across Gyeonggi warehouses, the most common cause of gradual hash rate decline is not failing chips—it is intake filters packed with fine dust that restricts airflow enough to push board temperatures past throttling thresholds.

The 0.05 TH/s Threshold

Units rated at 0.05 TH/s and above generate enough heat that even a 5°C rise in ambient board temperature can trigger automatic clock reduction. A filter that looks clean from the front often has a solid mat of dust on the internal side, invisible until you remove the grille.

What We Recommend

For units in warehouse environments without positive-pressure cooling:

1. Inspect intake filters every 14 days during summer, every 30 days during winter.
2. Photograph the filter against a white background to track discoloration over time.
3. Keep spare filters on-site—most Antminer and Whatsminer models use standard dimensions available from Korean suppliers for under ₩8,000 per unit.
4. After filter replacement, allow 4 hours of runtime before comparing pool statistics to establish a new baseline.

A Real Example

During an assessment in Yongin last May, six Antminer S19 units showed a collective 9% hash rate drop over three weeks. Pool configuration was correct. Thermal imaging revealed all six had intake temperatures 11°C higher than exhaust—backwards from normal operation. Filter replacement on four units (two had already been changed by the operator) restored output within one pool difficulty window.

Filter maintenance is unglamorous work. It is also the cheapest intervention available for preserving SHA-256 output on hardware with straightforward upkeep requirements.