CADR Rating of Air Purifiers 2019
1. The size of the room where you intend to use the purifier (the recommended sizing is also marked on the label). However, the ideal formula to calculate the best possible relation of the room’s sizing to the one of the cleaner’s is to multiply the CADR number for smoke fume particles by 12. The resulted figure should equal or be greater than the room’s volume that is measured in cubic feet.
2. The size of the removed contaminants, measured in microns. For instance, the average size of the smoke particles is from 0.003 up to 0.04 microns; the pollen is around 10-100 microns, and the dust can be 10-40 microns.
3. The percentage of the removed pollutants. The requirements are various for every particular type of the air purifier, for example, a HEPA filter has to pull 99.97% of the air contaminants to be approved.
4. The volume of air going through the air cleaner. The bigger is the airflow, the faster the cleaner will be getting rid of the pollutants.