Why Exhaust Delta Matters More Than Peak Hashrate in Shared Racks
In colocation aisles, the temperature rise from inlet to exhaust predicts neighbor impact better than headline TH/s figures.
A miner that peaks at spec hashrate for thirty minutes but runs a 12°C exhaust delta will heat the blanking panel on the adjacent slot. Farm managers in Jeonju corridors often ask us for TH/s first; we lead with delta because it determines whether middle-density placement is safe.
What we log
During thermal farm assessments we place one probe at the intake grille and one at the primary exhaust point. The delta across a full duty cycle — not just the first hour — tells us how much heat the aisle must absorb.
Aisle width multipliers
Narrow aisles below 1.2 meters amplify bleed. We apply a simple correction: if aisle width is tight, we downgrade middle-density scores even when delta looks acceptable on the bench.
Firmware idle states
Some firmware drops fan speed aggressively at idle, causing rapid delta spikes when load returns. We note these patterns because hosted farms cycle load during maintenance windows.
Takeaway for operators
Before you argue about hashrate with your hosting partner, ask what exhaust delta they have measured on identical hardware in their reference rack. If they have no data, a bench assessment is cheaper than repositioning a full aisle after install.