What's CADR for air purifier?

CADR comes from AHAM (Association of Home Appliance Manufacturers).   This is a value for you to compare the amount of clean air from air purifiers. The AHAM CADR is a voluntary program so it’s hit or miss whether an air cleaner will have a CADR number.

There are 3 sizes of particles measured. They each give an measurable indicator of the air purifier’s ability to remove the smaller particles (smoke) up to larger sized particles (pollen).

Smoke CADR (0.09 – 1 micron)
Dust CADR (0.5 – 3 microns)
Pollen CADR (5 – 11 microns)
There are two factors that influence the air purifier CADR ratings scale.  They are the filter efficiency and the air flow through the filters.So both the filter efficiency and the wind wheel efficiency play an important role.Olansi air purifier have good performance for the two factors.

Taken together they give an indication for how much filtered air you will get from the air purification system.

The CADR represents the amount of clean air coming out of the air purifier on the highest fan speed.  It is only measured on the highest fan speed.  If you run the air cleaner on a lower fan speed then the CADR will be lower since the fan airflow is less.

CADR is measured in cfm or cubic feet per minute in the US.

For example, if the air purifier produces 100 cfm and the filter removes 90% of particles (efficiency) then the CADR for the air purifier will be 90.  100 times 90%.

In Asia and Europe the CADR for air purifier is given in cubic meters per hour.

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