Air Purifier CADR and Room Size Explained
How to interpret airflow, filters and real-world noise.
Independent UK buying advice · Compare features and check current product details before ordering.
CADR is more useful than vague room claims
Clean Air Delivery Rate helps compare particle removal, but quoted room coverage depends on assumptions. Consider the air changes required for your room.
- Measure room area and ceiling height.
- Compare CADR in m³/h where provided.
Filters and costs
HEPA-type claims differ. Check independently stated filter performance, sealing and replacement availability.
- Check replacement filter prices.
- Do not assume carbon filters remove every gas or odour.
Noise and positioning
A purifier that is too loud may be left off. Compare noise at realistic operating speeds and keep intake clear.
- Avoid blocking airflow.
- Air cleaners are not substitutes for source control or ventilation.
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