How to check CADR and CCM parameters of air purifiers without stepping on pitfalls

Many people only consider the appearance and price when buying air purifiers, but overlook the two core parameters of CADR and CCM. Even if one spends a high price on a high-end model and places it in a home of over 100 square meters, the purification efficiency may not even reach half. In fact, CADR determines the speed of purification, while CCM determines how long the filter can last. Both factors need to be considered, but we cannot just focus on the size of the numbers. A more reasonable approach is for CADR to select appropriate values based on room area, rather than blindly chasing after higher values; CCM prioritizes P4 and F4 levels, while paying attention to specific values, as levels are only passing lines.

The so-called CADR refers to the output of clean air, which can be understood as the purification speed. The higher the value, the more clean air is output per unit time, and the larger the suitable space. Particulate CADR mainly deals with pollution such as PM2.5 and pollen, while formaldehyde CADR targets decoration pollution. Consumers should pay attention to it according to their actual needs. CCM is the cumulative purification amount, representing the total amount of pollutants that the filter can intercept before performance degradation. The higher the value, the more durable the filter is, and the later replacement cost is usually lower. The particulate matter CCM is divided into P1 to P4 levels, and the formaldehyde CCM is divided into F1 to F4 levels, with P4 and F4 being the highest levels in the national standard.

The core principle in choosing CADR is to match based on area, rather than the higher the better. For living rooms or large spaces, it is recommended to start with a particle CADR of 400m ³/h, which can be higher for larger units. A bedroom with a capacity of 200 to 300m ³/h is usually sufficient, and it is important to pay attention to whether the sleep noise level is below 35 to 40dB. When using newly renovated houses for formaldehyde removal, it is recommended that the formaldehyde CADR be no less than 200m ³/h. If conditions permit, choosing a capacity of 400m ³/h or above would be more secure. A simple estimate of the applicable area can be obtained by multiplying CADR by 0.07 to 0.12. For example, when CADR is 500m ³/h, it is approximately suitable for 35 to 60 square meters; The required CADR can also be estimated by multiplying the room area by 5 to 7.

However, higher CADR is not necessarily better. Excessive numerical values often indicate higher power consumption and noise of the fan, and placing it in a small room with medium to high performance can easily lead to excessive performance. More importantly, the machine not only needs to perform well in its new state, but also depends on its sustainability after long-term use, which involves CCM.

The choice of CCM cannot be solely based on its level. Priority is given to P4 and F4 because they belong to the highest level of the national standard. Below this level, the frequency of filter replacement usually increases significantly. But P4 and F4 are just the entry barriers, and the actual cumulative purification capacity of different products of the same level may differ by several times. Truly durable models often have CCM values significantly higher than the baseline, such as particulate matter exceeding 12000mg and formaldehyde exceeding 1500mg. Some models have formaldehyde CCM values of up to 13057mg and particulate matter CCM values of up to 51450mg, far exceeding the national standard upper limit. Only then is it more likely that the filter life of such products will be extended.

When avoiding pitfalls, the first thing to do is to avoid only looking at the CADR on the promotional page. Some models have high CADR for particulate matter, but low CADR for formaldehyde, which must be checked separately against the parameter table. Formaldehyde removal cannot rely solely on adsorption. Ordinary activated carbon is prone to saturation and may cause secondary release when the temperature rises. Prioritize models with decomposition technology, such as catalytic decomposition, which can decompose formaldehyde into water and carbon dioxide, and have more durable filters. Secondly, it is important to pay attention to the long-term cost of the filter. Some machines may have a cheap body, but the filter is expensive and frequently replaced. Over the years, the cost of consumables may exceed that of the machine itself. It is best to settle this account before purchasing.

The risk of ozone is also worth paying attention to. Models with electrostatic dust collection, ionization, or ultraviolet technology may generate ozone during use. Pure physical filtration solutions such as HEPA with activated carbon should be preferred, and the product should be clearly labeled as zero ozone. Scene matching is equally important. Pet raising families should pay attention to their ability to remove allergens and purify odors. For mother and baby families, disinfection records and noise reduction performance can be considered. For newly renovated families, the focus should be on formaldehyde decomposition ability and F4 level.

Overall, selecting the right parameters is only the first step, and the actual effect also depends on the filter configuration, noise performance, and certification qualifications. It is recommended to start with H13 for HEPA filters, and then match them based on room size, major pollutants, and budget to avoid most purchasing misconceptions.