CADR rating and ACH rating explained

What is the CADR rating of an air purifier? And what does the ACH rating tell you?

If you’re wondering what these two things mean, then this article is for you. So keep reading.

The ACH and CADR ratings on an air purifier are the most important specifications to understand. An air purifier could have all of the best
features in the world but if these ratings are not right, the device won’t be as effective for you.

So what is the CADR rating of an air purifier? The CADR rating tells you how well an air purifier can clean the air in a certain size room.

And it focuses on three airborne contaminants: dust, pollen and tobacco smoke.

The higher the CADR number is for a pollutant, the faster the machine filters the air for it. As a rule of thumb, the CADR ratings should
be at least two-thirds of the room size coverage.

For example if an air purifier claims to handle 300 square feet, then it needs to have at least a CADR rating of 200 for each contaminant. Otherwise it’s not as effective for that particular substance.

Now what is the ACH rating of an air purifier? The ACH rating tells you how many times the device can exchange the full volume of air inside a room. For example, a 4x ACH rating means that the air is filtered four times in one hour.

The higher the ACH rating, the more efficient the device is at cleaning the air for a certain room size.

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