Air Change Rate (ACH)
Ventilation rate in air-changes-per-hour from supply-air flow and room volume.
Air changes per hour
6.0ACH
Supply flow
333L/s
Formula, assumptions, and limits
Shipboard standards (SOLAS + STCW): cabins 6 ACH, galleys 20–30, machinery spaces 30+, battery rooms ≥ 10 with H₂ dilution spec.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Supply air flow | m³/h | fan rating | |
| Room volume | m³ | GA plan |