Air Purifier Test Standards: CADR and POLAR
To purify an entire room properly, an air purifier must sense pollution events automatically, capture particles and pollutants such as PM 2.5 and PM10 and harmful gases, and project cleaner air to every corner of the room evenly. But how do you know what a good air purifier is? Here's a guide to help you understand the differences in test standards.3 July 2023
How is CADR calculated?
There are two measured factors that influence the CADR rating of the product tested:
1. The filter efficiency
2. The air flow through the filters
The CADR score is calculated by measuring how much faster a purifier removes particles from the air compared to how quickly they would naturally drop and settle on surfaces.
This is then multiplied by the volume of the test chamber – meaning that the chamber size is inextricably linked to the overall score. If the chamber is small and unrepresentative of real homes, the score may not be representative of real-world use.
Dyson Purifier Big+Quiet Formaldehyde
When developing our largest, quietest, and most powerful purifier to date, Dyson engineers refused to rely solely on computational software, the CADR test, or even our existing POLAR chamber.
Dyson engineers constructed an even larger, 100m2 test chamber at our Hullavington campus (UK). The chamber is equipped with 36 sensors to provide precise readings of the purifier's ability to purify the air in the equivalent to a large, open-plan living space.