Ventilation rate in air-changes-per-hour from supply-air flow and room volume.
Formula
$$ ACH = \frac{\dot V_\text{supply}}{V_\text{room}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $\dot V_\text{supply}$ | Supply air flow | m³/h | fan rating |
| $V_\text{room}$ | Room volume | m³ | GA plan |
Sources
- ASHRAE 62.1 - Ventilation.