The majority of air purifiers have a clean air delivery rate (CADR) number on the label, which is a measurement devised by the Association of Home Appliance Manufacturers (AHAM) to aid consumers in understanding how well a device filters different particles in a particular room size.
When an air purifier has a pollen CADR of 200, it may provide 200 cubic feet of fresh air per minute to lower the pollen level.
The greater the number, the wider the room the gadget may fairly be anticipated to clean, and the faster it can remove particles.
Consumer Reports suggests an air purifier with a CADR of 240 or above for its suggested room size if you’re buying one to clean the air.
According to room size, the Environmental Protection Agency (EPA) recommends the following minimum CADR ratings:
| Area (square feet) | 100 | 200 | 300 | 400 | 500 | 600 |
| Minimum CADR (cubic feet per minute) | 60 | 130 | 195 | 260 | 325 | 390 |
The EPA warns that most air purifiers don’t have CADR ratings high enough for a normal room size to efficiently eliminate big pollution like dust mites and allergies associated with cockroaches.
Remember that the CADR rating of an air purifier represents the ideal scenario. These figures are established in regulated testing settings. Your air purifier may not perform at its best in your house due to factors like draughts or humidity.