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Dentists, hygienists, and other professionals looking for an air purifier:

Are you considering a Dyson purifier? Please note that the high airflow numbers advertised on Dyson’s website, or through chat and email support, represents the “fan mode” and NOT the “purifier mode”.

You may read or being given numbers in the range of 290 – 437 l/s or their equivalent in cfm unit. However these are the rate of airflow that the blower/fan can deliver at its highest speed.

If you consult the the technical or specification sheet the airflow rate in purifier mode is fraction of that number. For example a Dyson Pure Cool Tower, HEPA filters the air at a rate of 41.7 l/s.

You may ask them about CADR (Clean Air Delivery Rate) numbers to get a better sense of their air filtration rate.