Air purifier conscience guide, so buy, no longer have to worry about being pitted
Under the smog, life is important. The smog of earning money, the smog of the official, the ordinary people, know the smog, anti-smog.
Americans love to sterilize, Japanese people are afraid of pollen, and Chinese hate PM2.5. In the special industry of air purification, we are the only country in the world that is seriously polluted by smog and has the strength and willingness to purchase air purifiers. Hey, so, in the face of thousands of air purifiers on the market, from hundreds of oceans to tens of thousands of oceans, how can you choose not to be deceived?
Then, before entering the topic, the sheep and the old wet first knock on the blackboard, you must know the following points –
We purchase air purifiers, mainly for indoor pollutants. Simply put, indoor air pollutants fall into three categories:
1 Particulate matter | such as inhalable particulate matter (PM10), smaller particles can inhale PM2.5 in the lungs, pollen, pets or body exfoliation;
2 Volatile Organic Compounds (VOC) | including various odors, formaldehyde or toluene pollution caused by decoration;
3 Microorganisms | Mainly viruses and bacteria.
The principle of removing indoor air pollutants
Mechanical + electrostatic + water filter
Mechanical type, that is, “filtration”, high air volume fan + filter screen, can intercept some particles and microorganisms, large particles “adsorbed on the filter screen” and adsorbed, small particles are absorbed by the electrostatic force of gravity of the filter fiber, Therefore, the filter screen is often a layered structure, and one layer cannot be blocked.
The most popular air purifiers on the market, with the most mature technologies and products, are mechanical filter purifiers. Electrostatic and water filtration purifiers, although there is no need to replace the filter, the filtration efficiency is very general, it will bring secondary pollution such as ozone and chlorine, and the problem of microbial growth, so it will not be described.
HEPA high-efficiency filter
(High-Efficiency Particulate Air Filter)
Referred to as HEPA
Various countries have different standards for high-efficiency filters, and European HEPA grades (EN 1822) are often mentioned. In the latest EN 1822:2009 standard, H13 grades or higher can be called HEPA (so strictly used) The H10-H12 purifier can no longer be called HEPA).
From H11 (filtration efficiency >98%) to H13 (filtration efficiency >99.97%), with the same CADR value (described below for CADR), the purifier can be faster with the purifier of the H13 filter. Lower, while the H11 filter takes longer. The higher the level of HEPA, the better. Of course, the higher the level, the more expensive the price.
Some air purifiers add a lower filter front filter to the HEPA to filter out larger particles such as hair, which improves HEPA efficiency and longevity, as well as cost control.
HEPA is the core component of the purifier and needs to be replaced at regular intervals.
Activated carbon or zeolite
Both HEPA and pre-filters filter particulate matter and some microbes, and other important indoor air pollutant, volatile organic compounds (VOCs) such as formaldehyde. Toluene requires an additional filter to remove. The most widely used is the activated carbon filter. Activated carbon absorbs VOC through its huge surface area, removing formaldehyde and various odors. The same is true of the basic principle of zeolites.
About air purifier
The most important CADR and CCM
1 CADR (Clean Air Delivery Rate), the clean air output ratio
CADR is the ratio of the air purifier output clean air obtained by the American Association of Home Appliance Manufacturers (AHAM) according to strict test standards. It is generally expressed by the area ratio time (domestic use m3/h), that is, each How many volumes of air are purified in an hour. The higher the CADR value, the higher the purification efficiency.
Simply put, CADR/10 (poor air quality can be increased to 15) can be used as a reference for purifying the area. For example, the nominal CADR value is 750m3/h purifier, the applicable purification area is about 750/10=75m2, if the purification requirement is higher, it is 750/15=50m2.
International standards require that the purifier must change the air of the area to be used more than 5 times per hour, so each purifier will mark its applicable area, such as 20m2, the height of the floor is 3m, which is 60m3, which requires the purifier. The air volume needs to be above 300m3/h.
2 CCM (Cumulate Clean Mass), cumulative purification
As the name implies, CCM stands for the endurance of the purifier. The new national standard divides the CCM value into 1~4 grades (the higher the number is, the higher the level), corresponding to different pollutants, the particulate matter uses the P1~P4 standard, and the formaldehyde uses the F1~F4 standard.
The CCM value determines that the number of days the screen can be used can be determined under conditions where the purifier, room area, and contaminant concentration are known. However, because the national standard threshold is low, some better purifiers will be marked as “Super P4/F4” or “Several times P4/F4”.
Air purification process
The indoor environment in which we live is always in gas exchange with the outside world. Indoor pollutants, such as formaldehyde that has just been renovated, particulate matter produced by smoking, and odors of other objects, overall, indoor particulate matter or pollutants, have been in a state of dynamic balance.
The function of the air purifier is to control the particulate matter or pollutants in the dynamic equilibrium state to a lower concentration range through the combination of “high air volume + high filtration efficiency”. In order to achieve a better purification effect, it is necessary to check the air leakage in the room. If the air leakage is very serious, even the best purifier, the high CADR, and CCM are also white.
The only solution is the fresh air system. By continuously changing the indoor and outdoor air, the fresh air system always maintains the indoor air pressure higher than the outdoor, thus preventing the outdoor air from directly entering the room. The Yang Lao Wet House installed a fresh air system before the renovation, and it has its own PM2.5 filter core. On the basis of the ordinary fresh air pumping air, the purified air is sent into the room.
From this point of view, the air purifier can only temporarily purify the indoor air, does not have the ventilation function, and the purification area is limited, and most fresh air systems must be installed before the house is renovated, so the air purifier can be said to be unmounted. A compromise between the family of the fresh air system.
Noise is an inevitable problem for all filter purifiers. The greater the air volume, the greater the noise. Even if manufacturers use a variety of sound-absorbing or sound-proof methods, once the air purifier is turned on, including the fresh air system, it will still add a sinuous background sound to the home.
The noise of the purifier for a long time to work stably, as well as the serious pollution of the air. The noise during maximum power operation is a factor to be considered when purchasing. Different types of purifier manufacturers will basically indicate the decibel number (dB) during operation. Reference.
Additional features / smart services
In today’s smart age, many home appliances add one or more additional features to the product, such as APP control, smart detection, mute or sleep mode, etc., such as smart detection, you should pay attention to the real-time monitoring of the air quality near the machine. , or the entire room, and whether the air purification effect in silent or sleep mode is guaranteed.
Sheep and old wet to say separately is after-sales, this is a problem to buy any home appliances, of course, it is still related to the manufacturer, it is recommended to choose the mainstream model of the mainstream brand as much as possible, saving the factory because of the niche and abandoned it into three.
Of course, the air inlet and outlet of the purifier, the placement and land occupation, the ease of movement, and the level of the color are all important factors that influence your final decision.
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