Most of the time, the focus of indoor air purification is filter efficiency. It’s naturally an important issue, but what is often forgotten is the amount of air actually going through the purifier. If only a part of the air in a room can be purified, filter efficiency does not guarantee you clean air. In order to do proper air purification, all of the air in the room needs to go through the purifier, in fact at least five times per hour.
The most important attribute of a purifier is its clean air delivery rate, CADR. This value takes into account both the filter efficiency and the volumetric flow through a purifier. CADR is measured by multiplying these two values, and so tells you how much clean air a purifier can really produce. This is why CADR is the best and only real way to compare different purifiers.
Since CADR measures the amount of air that has had particles of a given size range removed, CADR values are measured for different particle sizes. The most stringent measurement is CADRsmoke with particles within the size range of 0.1 – 1.0 microns. Other ones are CADRdust, 0.5 – 3.0 microns, and CADRpollen, 5.0 – 11.0 microns. However, as the CADRsmoke size range includes the most difficult particles to remove from air, around 0.1 micron in diameter, having a high CADRsmoke value also means having high CADRdust and CADRpollen values. So CADRsmoke is the one that really lets you tell air purifiers apart.
The CADR value for purifiers is expressed in cubic feet per minute, CFM, or in cubic meters per hour, CMH. smAIRt™ purifiers offer the highest CADRsmoke
value on the market:
- 1200 cubic meters per hour (CMH)
- which equals 700 cubic feet per minute (CFM)
These values tell you that one smAIRt™ purifier can effectively purify the air in an area of up to 100 square meters*, including filtering out even the most difficult particles. Many other manufacturers claim similar values, but we use only the strictest measurements as your health is of the utmost importance to us.
* this applies for a normal room height of 2.5 meters. The square meter amount is calculated by multiplying the CFM value of a purifier with the standard factor of 0.144 (here: 700 CFM x 0.144 equals 101 square meters).