clean air delivery rate cadr

You may wonder what is clean air delivery rate or CADR means while trying to select an Air Purifier for your home or office. Let's find out. The Clean Air Delivery Rate-cadr meaning, or CADR for air purifiers, can tell you how efficient the air purifier is at removing specific contaminants from different room sizes. It reflects the volume of air in cubic feet per minute (CFM) that flows through the air filter. In this blog, let us learn cadr calculation, making you more confident when selecting  air purifier!

How to Calculate CADR Value?

MSA3 air purifier high cadr

The air purifier then operates in the chamber, and the reduction in particle concentration is measured. CADR, CADR stands for Clean Air Delivery Rate. CADR is expressed in cubic feet per minute (CFM) and indicates the volume of clean air produced by the purifier.

Three CADR values are assigned for dust, pollen, and smoke, representing the purifier's effectiveness against each particle type. Higher CADR values indicate faster and more efficient air purification.

1. The formula for calculating the value of "air purification efficiency" is: "CADR average value" or "single CADR value" ÷ certification applicable area × 100%.

2. The air purifiers of regular manufacturers will be marked with CADR value (the amount of clean air per hour), and the applicable area = CADR×0.12 (0.12 is the conversion factor ), for example, the CADR of an air purifier is 500 Cubic meters/hour, applicable area=500*0.12=60 square meters. At present, the area of ​​most households is about 100 square meters, so in reverse, a relatively suitable CADR for an air purifier should be: CADR=100/0.12=833 cubic meters/hour. There is a domestic brand called EAWADA. Their products are manufactured by Foxconn (Foxconn is the one that manufactures Apple mobile phones). The CADR is 880 cubic meters per hour, which is suitable for an area of ​​about 100 square meters.

If you feel it is difficult to calculate those parameter, you can visit some online calculators to estimate the CADR required for each room, for example,

how to calculate cadr for air purifier

Just fill in the blank

how to calculate cadr

And here is the result:

how to calculate cadr


1. CADR in CFM = (ACH x Room Area x Ceiling Height) / 60

2. CADR in CMH(m³/h )= CADR in CFM x 1.699

By comparing the result with the Specification of Product CADR, you will more clearly know how many air purifiers you need for home.

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