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 neutralise 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...

View the range

	PU4020 U0 400 Sq feet	PU6020 U0 835 Sq feet
	Auto	Auto
CADR SMOKE	78	165
CADR DUST	88	170
CADR Pollen	98	185
Filters	Pre-filter Active carbon filter Hepa filter NanoCaptur™ filter	Pre-filter Active carbon filter Hepa filter NanoCaptur™ filter
Number of speeds	4	4
Timer/Delayed start	UP TO 8H	UP TO 8H
Sensors	PARTICLES	YES - PARTICLES + GAS
Air Quality Indicator	YES	YES
Automatic mode	Auto + Night	Auto + Night
Ambient mood lighting	YES	YES
Filter change indicator	YES	YES
filters included	4	4
Energy star certified	YES	YES