low-frequency-noise band of the data-center hum (fans, dry-coolers, transformers) that dBA discounts and dBC/octave limits capture
20-200 Hzobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2026 |
| Source | EESI; Ramboll; Larson Davis acoustic practice |
| Review | checking…review by 2026-08-10 · standard cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | low-frequency-noise-band-of-the-data-center-hum |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.