ENGINEERING HUB
Measure clearly.
Calculate consistently.
Practical SI tools for commissioning checks. Each result shows its assumptions and method so it can be checked against the approved design.
CALCULATOR
Air changes & flow per person
Express a measured room airflow in nominal air changes per hour and flow per occupant.
Method and scope
ACH = 3.6 × Q (L/s) / volume (m³); flow per person = Q / occupant count.
Identify whether the measurement is total supply, extract or outdoor air. Recirculated supply is not outdoor air. These arithmetic results do not prescribe NZ ventilation rates or demonstrate G4 compliance.
The pre-filled numbers are illustrative examples. Replace them with measured values or verified project inputs. Calculations do not save data or alter equipment.