What Makes A Good Purifier?
What makes a good air purifier?
To ensure an effective improvement of indoor air quality, it is important to choose your air purifier carefully.
Several factors must be taken into account.
  • Technology
    There are numerous purification technologies: photocatalytic, plasma, ionization, filtration, water purification, etc. Some technologies, while effective, may emit harmful residues during the pollutant decomposition process. Others have limited effectiveness in terms of the pollutants or surface areas treated. Air purifiers that are equipped with filters are recognized for combining optimum effectiveness and safety.
  • The filters
    A good purifier generally has several filters suitable for different pollutants:
    - a pre-filter to stop large particles and avoid the other filters becoming blocked,
    - a HEPA filter to stop the finer particles,
    - an active carbon filter to neutralize gases and odors,
    - dedicated filters for certain very dangerous pollutants such as formaldehyde.
    Aside from the number of filters, the quality, thickness and size as well as the hermetic seal on the filters are essential for an air purifier to be effective.
  • Automatic detection of pollution
    Devices equipped with an automatic function enabling air purification at your convenience. These devices generally feature one or more sensors (for particles, gas) that detect the level of pollution in the home. According to the concentration measured, the air quality indicator changes color and the filtration speed is automatically adjusted.
  • Air flow and Clean air delivery Rate (CADR)
    The air flow must be as high as possible to guarantee the optimum circulation and purification of the air. CADR is a measurement that allows us to quantify how fast a purifier is able to remove the particles present in the room. Equal to the flow, the higher the CADR, the higher the performance of the purifier. However, you must be aware that the higher the air flow and the CADR, the higher the risk of the sound level increasing with it.
  • Sound level
    Since the air purifier will feature in your living rooms, both its design and size must be taken into consideration, to allow it to harmoniously integrate with the decor in your home.
  • Design
    Since the air purifier will feature in your living rooms, both its design and size must be taken into consideration, to allow it to harmoniously integrate with the decor in your home.
All Rowenta® devices meet these quality requirements...
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PU4020 U0 400 Sq feet PU6010 U0 835 Sq feet PU6020 U0 835 Sq feet
Auto Auto Auto
CADR Smoke 80 164 164
CADR Dust 91 181 181
CADR Pollen 105 190 190
Filtres (4 stages filtration) Pre-filter
Active carbon filter
Hepa filter
NanoCaptur™ filter
Pre-filter
Active carbon filter
Hepa filter
NanoCaptur™ filter
Pre-filter
Active carbon filter
Hepa filter
NanoCaptur™ filter
Number of speeds 4 4 4
Timer/Delayed start Up to 8h Up to 8h Up to 8h
Sensors Yes No Yes
Air Quality Indicator Yes No Yes
Automatic mode Auto + Night Manual Auto + Night
Ambient mood lighting Yes Yes Yes
Filter change indicator Yes Yes Yes
Filters included 4 4 4
Energy star certified Yes Yes Yes

*Acoustic pressure measured at 4 feet and 11 inches from the air purifier in a semi-anechoic chamber.