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🌬️ Air Purifiers
Air purifiers for PM2.5, allergens and odours — matched to your room size and filter replacement cost.
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What actually matters in this category
CADR (Clean Air Delivery Rate)
The single most important number. Aim for at least 3× your room volume in m³/h. A 50 m³ bedroom needs 150–200 m³/h.
Filter grade
True HEPA H13 captures 99.95% at 0.3 microns. H11 or 'HEPA-like' is noticeably weaker.
Quiet-mode noise
Under 30 dB for a bedroom. If the spec sheet omits it, be suspicious.
Replacement filter cost
Check before buying. If it costs half the unit price or is unavailable, running cost is high.
PM2.5 sensor
Useful but not essential — auto mode based on a cheap sensor can be worse than manual.
Buy if…
✓ Worth buying when
- You live in an area with seasonal PM2.5 or smoke
- Someone in the home has allergies or asthma
- Your bedroom is sealed and you want overnight filtration
- You have pets and want to reduce dander
✗ Skip it when
- You keep windows open most of the day — filtration is wasted
- The room is far larger than the unit's CADR rating
- You only need odour control — a carbon filter alone may be enough
Related guides
- Matching an air purifier to your room size
- Robot or cordless — which to buy first
- Kitchen appliances worth the counter space
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