Reader's Question>>>
Ms. Xia, a consumer looking to purchase an air purifier, noticed that the products are not only expensive but also come with a variety of confusing features. She hopes that the "You Can Order, I Interview" column can ask experts to explain the basic knowledge of air purifiers and help consumers make informed choices.
Reporter's Interview>>>
The Pass Rate of Random Inspection Is Below 90%
Last week, the Jiangsu Provincial Quality Supervision Bureau released the results of a random inspection on air purifiers. Out of 55 batches tested, only 47 passed, resulting in a pass rate of 85.5%. The main issues found were related to labeling, power input and current, power connection, and noise levels. Li Long, deputy director of the Suzhou Metrology and Testing Institute, explained that high power could cause overheating of the wiring and degrade insulation, potentially leading to safety hazards. On the other hand, low power might overstate the product’s performance, affecting its real-world effectiveness.
Consider the Usage Scenario When Purchasing
So, how should consumers choose the right air purifier? According to Li Long, it's important to select a model based on where and how it will be used. For families with elderly people or children, a purifier with microbial removal capabilities is recommended. If you're moving into a new home, a unit that targets gaseous pollutants like formaldehyde would be ideal. In areas with poor outdoor air quality, a purifier with strong fine particle filtration is essential. For homes in humid climates, a purifier with antibacterial and anti-mold functions may be more suitable. If there are pets at home, look for models that remove allergens. And for complex pollution situations, a multi-functional purifier that handles fine particles, gases, and allergens is the best choice.
Clean Air Delivery Rate (CADR) Is a Key Indicator
Experts emphasize that the Clean Air Delivery Rate (CADR) is one of the most important performance indicators for air purifiers. CADR measures the device’s ability to deliver clean air. When prices are similar, a higher CADR value means better performance. There is also a relationship between CADR and room size. The formula is: applicable area = CADR × k, where k ranges from 0.07 to 0.12. For example, a 16-square-meter room would require a purifier with a CADR of 150–200 m³/h. If the CADR is too low, the purification effect may be insufficient; if it's too high, it could waste energy and resources.
It’s also important to note that air purifiers continuously clean the existing air and do not bring in fresh air. Therefore, it’s advisable to open windows periodically when using the device for long periods. However, during times of poor outdoor air quality, window ventilation should be limited to prevent the entry of new pollutants.
In summary, choosing the right air purifier requires understanding both the technical specifications and your specific needs. With the right information, consumers can make smarter and safer purchasing decisions.
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