Search the Community

How to pick a car air purifier? CADR is the key performance indicator. The Clean Air Delivery Rate, or CADR for short, is an indication of the volume of filtered air delivered by an air purifier. CADR is given through a process called the ANSI/AHAM AC-1 standard: (1) The purifier is placed in a testing chamber of a specified size. (2) Before the purifier is activated, the amount of contaminants in the room is measured. (3) The purifier is activated for a period of twenty minutes, during which time the amount of contaminants is periodically re-evaluated. (4) Finally, the reduction in contaminants is compared to their natural rate of decay Why is the purification rate of "99.xx%" not reliable? Just by reading the end result of "99.xx%", you do not know its testing process: (1) the size of the testing chamber (2) the amount of contaminants (3) the working hours of the air purifier In simple words, any air purifier can show a result of "99.99...%" if you put it in a tiny chamber and let it work long enough.