ACH without shortcuts

ACH is a simplified flow metric and does not prove uniform cleaning in every corner.

Key points

Understand the relationship between airflow, room volume and air changes per hour.

How to use this in practice

Measure the room and record the operating conditions first. Compare values at the same speed and under similar conditions. A marketed room area is not universal; volume and target airflow are more transparent.

Limitations

Outdoor conditions, building leakage, open doors, ongoing sources and furniture layout can materially change performance.

Related tools

CADR · ACH · Log