Since the smog at the beginning of the year, many people have added air purifiers at home. But how much can it do? CCTV's "Weekly Quality Report" sent five kinds of hot air purifiers on the market to the inspection department. It was found that the actual detection results of PM2.5 removal rate of 3 products were lower than the nominal effect, giving too much superstition air. Consumers who cleaned the product sounded the alarm.
In the investigation, the reporter found that although there are many types of air purifiers and different purification methods, the largest market share is still filtered. This type of purifier uses a porous filter material to trap and collect particles suspended in the air to purify the indoor air.
Generally, the air purifier has three or four layers of filters. The first layer is a pre-filter, mainly for removing large dust and hair particles; the second layer is a high-efficiency HEPA filter that can filter inhalable particles with a diameter of 0.3 to 20 microns, including PM2.5; The third layer is an activated carbon filter, which is mainly used to remove odor. “If you can't clean or replace the filter that has accumulated dust and particles in time, the function of the purifier will be degraded. The dust and mold accumulated on the filter screen may cause secondary pollution to the room.†National indoor environment and Song Guangsheng, director of the Environmental Quality Supervision and Inspection Center, pointed out that the use of filter-type air purifiers must pay attention to the life of the filter and filter.
Many air purifiers now have a reminder for filter replacement. According to the instructions, when the indicator light is on, the consumer needs to replace the filter. If there is no indicator light, you need to observe and compare the service life of the product manual according to your own frequency of use, and do the cleaning and replacement work.
Usually, the outermost pre-filter is dirty, and when you turn on the machine, you can see the black gray clearly. At this time, it can be cleaned by a vacuum cleaner. If it is allowed to be washed, it can also be washed under the faucet; for the washable deodorizing filter, it can be washed under the faucet according to the need. For the non-cleanable deodorizing filter, It is necessary to replace it according to the service life of the manual; for formaldehyde filter, it must be replaced regularly, especially the newly renovated room, it is best to change it every year; the general HEPA filter has a service life of 10 years, but it is best. Replace it in 2~5 years. In areas with serious PM2.5 problems, it is best to replace it frequently. If the indoor air is not particularly dirty, calculate the service life of the activated carbon layer for only 6 months according to the average daily use of 6~8 hours. It is best to change it once every six months.
When purchasing an air purifier, the clerk often tells the consumer, “The filter can be used directly after drying it out, and it will not be used for much maintenance. It is particularly economical.†However, Song Guangsheng said that the way of exposure does not work. In order to extend the service life of the product, in order to ensure the purification effect of the air purifier, the filter should be replaced regularly.
Need to be reminded that often open the window to ensure air circulation, is a better way to clean. In the case of serious outdoor air pollution or indoor environmental pollution, an air purifier can be used to assist. When opening the air purifier, close the doors and windows to create a relatively closed environment to ensure better purification of the product; if the outdoor air quality is good, there is no need to open the air purifier for a long time, the ventilation should be the first select. Try not to place the air purifier on the wall or furniture. It is best to put it in the middle of the house or leave the wall more than 1 meter away from the wall. Due to the high amount of harmful gases around the purifier, it is generally not allowed to place it too close to the human body.
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