Two different ways to describe moisture

Use absolute humidity when estimating water added to or removed from the air volume.

Key points

See why relative humidity changes with temperature even when the amount of water vapour stays similar.

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