Long-term performance of air purifiers: CCM

There are countless types of air purifiers on the market, and their long-term performance can vary greatly. Some air purifiers can only  last for two to three weeks before their efficiency declines. Some are half as efficient after only a few months.

What is it about?

It is because of the efficiency test methods and results.It is crucial to understand the themes of all air purification ratings: cumulative cleanliness or CCM.

Don't worry about CADR: All of this is related to CCM
In the national standard GB/T18801-2015, air purifiers can maintain long-term performance, and the key factors are as follows:

• Clean Air Delivery Rate (CADR)
• Accumulated Clean Quality (CCM)
• Clean energy efficiency
• noise

The detection of CCM particulate matter pollution is as follows (according to GB/T18801-2015 standard):

• Measure the CADR of the purifier under normal settings to obtain the initial value.
• Light a cigarette in a 3 square meter room and gently blow it with a fan.
• Turn off the fan and measure indoor particulate matter pollution.
• Place the air purifier indoors and open it to the setting you want to test.
• Turn on the fan in the room and seal it off.
• Ignite 50 (!) cigarettes in the combustion chamber (not at the same time!) and wait for the purifier to reduce the particle concentration to below 0.035 milligrams (mg/m3) per cubic meter.
• Turn off the purifier and let it sit indoors for another 30 minutes before removing it.
• Repeat these steps for 100, 150, 200, and more cigarettes until the CADR is less than half of the initial value obtained in step 1

Then, you can treat other gases (such as formaldehyde) again, following similar steps for gas filtration media (such as activated carbon filters).
The final CCM measurement you obtained indicates the continuous air cleaning ability of the purifier. It is evaluated by measuring the absolute volume of particulate matter and formaldehyde, which can be effectively filtered by the purifier before it begins to lose overall efficiency over time.
The results are classified as follows:

The higher the P and F values, the better the long-term performance of the purifier. It doesn't get any better than P4 and F4.

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