01
Check the room coverage
This criterion indicates the maximum recommended room area for the device, expressed in square metres. It is the essential starting point: an undersized purifier will not renew the air sufficiently, while an oversized model leads to unnecessary expense. On the current market, devices cover areas ranging from 25 m² for the least powerful to 135 m² for the most capable, with a median of 56 m². The site’s rating positions each product on this scale: a long bar signals high capacity.
Market median: 56 m²
02
Assess the purification flow rate
The purified air flow rate, measured in cubic metres per hour, determines how quickly the device renews the ambient air. A high flow rate ensures more effective purification, especially in polluted environments or during allergen peaks. Current models display flow rates ranging from 110 m³/h for the least efficient to 520 m³/h for the most powerful, with a median of 290 m³/h. The site’s rating reflects this performance: the longer the bar, the faster and more complete the air renewal.
Market median: 290 m³/h
03
Compare the noise level
Operating noise, expressed in decibels, directly affects comfort in a bedroom or living room. This criterion measures the device’s minimum sound level. The quietest models go down to 21.5 dB, while the noisiest reach 62 dB, with a median of 49.45 dB. Note: for this criterion, a lower value is better. The site’s rating favours quiet devices: a long bar indicates discreet operation, a short bar signals a noisier appliance.
Market median: 49.4 dB
04
Consider power consumption
The maximum power consumption, measured in watts, determines the running cost over time. A device operating several hours daily represents a significant annual budget. Current models consume between 7 W for the most economical and 65 W for the most power-hungry, with a median of 25 W. Here too, a lower value is preferable. The site’s rating highlights efficient devices: the longer the bar, the lower the consumption, and vice versa.
Market median: 25 W
05
Think about maintenance
All purifiers require regular filter replacement to maintain their effectiveness. Some models have a change indicator, others require manual monitoring. Check the availability and cost of compatible filters before purchase: an inexpensive device can prove costly to run if consumables are rare or expensive. Also consider ease of access to the filter compartment, which simplifies routine maintenance. A well-maintained device preserves its performance and longevity.
Benchmarks based on 30 recent market listings, collected on 4 October 2026.