“Select” and “Use” of air purifier
There are several main factors to consider when choosing a particulate cleaner, including the purification technology used in the purifier, the efficiency of the filter, the amount of clean air, the life of the purifier, the way the air is used, and the ease of use.
Particulate purification technology prefers simple physical removal. The safer and more efficient technology is the HEPA network and activated carbon adsorption. Electrostatic dust removal and negative ion technology will produce ozone. Although ozone can kill bacteria, viruses, and oxidize and decompose volatile organic compounds, excessive ozone can affect the respiratory system, causing respiratory diseases such as asthma, and can cause cancer in severe cases.
For HEPA technology, different filter grades have different purification effects. The higher the HEPA network grade, the smaller the particle size of the particles that can be filtered, and the better the filtration effect. However, the high filtration efficiency brings about a large wind resistance. The air purifier pays attention not only to the single filtration effect but also because the filtered air is recycled again. The filter has a high grade, although the single filtration efficiency is high, a higher power motor and a larger volume are required, so the higher the better, the better. Of course, the filtration efficiency should not be too low, otherwise, the final purification effect will be limited even if the cycle number is high.
HEPA’s ability to clean air is identified by Clean Air Output Rate (CADR), which is the ratio of clean air output by air purifiers obtained by the American Association of Home Appliance Manufacturers (AHAM) according to strict testing standards. The higher the CADR value, the greater the amount of clean air output per unit time by the purifier. However, the higher the CADR, the higher the noise, power consumption, volume, and price of the purifier. The daytime ambient noise we usually live in is 35 decibels. More than 50 decibels affect sleep and rest, and more than 70 decibels can interfere with normal conversations. High CADR purifier, the noise can reach 70 decibels in strong wind mode, even in the sleep mode, the noise is more than 40 decibels. Therefore, daily use does not have to place too much emphasis on high CADR. The manufacturer will mark the CADR value in the purifier parameters, or convert this parameter into a value suitable for purifying the room area. When purchasing, we only need to consider whether the clean area of the air purifier matches the room area. Similar to our choice of air conditioning based on the room area for cooling or heating.
The life of the purifier refers to the length of time during which the purification efficiency is maintained, that is, the effective service life of the purified material. It is obviously better to replace it after using it for half a year. The life of the purifier is related to the material and area of the filter itself, and also related to the CADR value of the purifier. Of course, continuous high pollution will shorten the service life. In the new national standards for purifiers, purifier life is expressed in terms of cumulative purification (CCM), which refers to the total amount of fine particles that the purifier can remove. Above this value, the purifier will fail. Generally, when the CCM value is approached, the purification efficiency has decreased, the wind resistance of the filter screen has increased, and the CADR is also decreasing. At this time, the filter screen should be replaced in time.
The way of entering and exiting the wind is also a problem to be paid attention to when selecting a purifier. The wind in the back – the front air outlet mode, easily leads to dust on the floor in front of the purifier, which increases the amount of dust in the indoor air. Below or behind the wind – above the airway, the dust on the floor can be sucked into the air purifier to remove the new air from above, the fine particles removal effect is better.
Many purifiers have the function of displaying the concentration of fine particles in the air, or roughly use “excellent, good, medium, and poor” to display indoor air quality. But for a general purifier, look at the changing trend of air quality, and don’t have to worry too much about the specific value displayed. Because the price of the household purifier itself is between 1,000 yuan and 10,000 yuan, the instrument that can accurately measure the concentration of particulate matter is worth at least tens of thousands of yuan.
Proper use of air purifier
When using an air purifier, first think about who to use and where to use it. It is generally preferred to target sensitive people, such as the elderly, children, pregnant women and people with respiratory diseases, in the bedroom and living room where people stay the longest in their daily lives.
The core filter of the air purifier is limited by the size of the machine and cannot be made very large. In the case where the total removal efficiency is constant, it is better to divide into several small purifiers in a room of suitable area, which is better than using a large purifier to process several rooms at the same time. In particular, the mode of airflow is complicated due to the structural layout of multiple rooms and the placement of furniture. It is better to let the air purifier fan handle the simple airflow effect. Otherwise, it is possible that the fine particles have not yet reached the air inlet of the purifier, and it is unknown where the airflow drifts. If only one large purifier is used, although the purification effect near the machine will be better, the effect of other rooms may not be ideal.
The location where the air purifier is placed is as close as possible to the source of contamination so that contaminants can be efficiently removed at close range. For example, a purifier for removing cigarette smoke can be closer to the smoker. However, the air purifier has a strong air intake and an air outlet, so it should not be too close to the person’s head position to avoid direct airflow to the face. When outdoor pollution is serious, the concentration of particulate matter near the doors and windows will be relatively high, and the air purifier can be placed in these places. If there is no clear source of pollution in the room, it is best to place the purifier as close as possible to the middle of the house, not to the wall or furniture. Keeping a sufficient distance from the wall can reduce the turbulent airflow and affect the purification effect.
It should be noted that the purification capacity of the air purifier is limited. Under normal working conditions, it can have a more obvious purification effect for a relatively closed room; if the room is not tightly sealed, the outdoor pollutants will infiltrate continuously, and the purification effect will be greatly reduced. Just like when using an air conditioner, the effect of opening the air conditioner and opening the air conditioner at the same time is definitely much worse than closing the window. Of course, if the outdoor air quality is good, it is best to use natural ventilation to purify the indoor air.
When using the air purifier, you need to pay attention to the core components of the purifier – the filter element and the filter. The effective life expectancy should be replaced in time, otherwise, the expected purification effect will not be achieved. The fine particles enriched in the filter element are where the dirt is trapped. If it is not removed in time, there is a hidden danger of secondary pollution.
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