What is CADR? And other air purifier testing questions
Purifiers come in many shapes and sizes, from whole-room and personal to portable purifiers. Even within these categories there is significant variation – in price, in performance, in appearance. So how can you choose the best purifier for your home?4 May 2022
How is CADR calculated?
There are two measured factors that influence the CADR rating of the product tested:
- the filter efficiency
- 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.
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