OFweek smart home network news: Some time ago colleagues went to Beijing on business trips, can not help but quipped: after wearing a mask to sleep it?
Hey, brother, don't forget that humans still have an invention called an air purifier.
Why do we need an air purifier?
Many people think of air purifiers when they are in the fog, and some people may think that the city where they are hazy is not particularly serious, so they think there is no need to buy them.
But this is a misunderstanding caused by the propaganda of some businesses in the past.
The air purifier is a product used indoors. It improves the indoor air, and it does not have much to do with the outdoor fog.
The only connection is that because the outside is very hazy and cannot be ventilated through windows, the air purifier is your solution.
Since this is the case, what is the problem with air purifiers?
In fact, it can be roughly divided into two categories: excessive particulate matter and excessively volatile organic compounds.
Among them, there are many kinds of particulate matter, such as dust particles brought in from the outside, PM 2.5, sensitized pollen, bacteria, viruses, dandruff, pet droppings and so on.
If the particles are inhaled too much and deposited in the body, they may cause respiratory diseases, and even increase the risk of lung cancer and heart disease.
Bacteria and viruses are prone to skin allergies and illnesses.
Volatile organic compounds are also known as VOCs. Their main sources are industrial exhaust gases, formaldehyde, kitchen fumes, detergents, and the body's own emissions.
The harm of VOC is very obvious. When the concentration of VOC in the room exceeds the standard, people will feel nauseous, have headaches, and if they are serious, they will become unconscious, because it will hurt human liver, kidney, brain and nervous system.
Therefore, there are many sources of pollution in the home. In the case of insufficient indoor air convection, or inconvenient windows in the winter, air purifiers are particularly necessary.
How to read a bunch of indicators in the business column?
When choosing an air purifier, you will surely encounter many professional and difficult-to-understand terms and indicators, and the salesman is taking the opportunity to flicker.
Air purifiers are not originally a money-saving investment, so the money spent has to be spent, it does not matter if you buy expensive, afraid to buy the wrong is still unaware.
So now, Xiao Bian uses various easy-to-understand words to interpret various indicators so that everyone can spend money.
Clean air tools
As mentioned earlier, the pollutants in the air contain particles and volatile organics, so the air purifiers must use different tools to eliminate them one by one.
First of all, if you want to eliminate particles, you need to use a HEPA filter.
HEPA is an abbreviation for High Efficiency Particle Air, meaning "high efficiency air filter."
It is made of stacked borosilicate microfibers and can remove at least 97% of particles in air with a diameter of 0.3μm.
However, due to the high cost of the HEPA filter, in order to prolong its life, the nucleator will also add a layer of pre-filter to remove a part of the particles.
As for volatile organics, that is, odors, you will need to add a layer of activated carbon filter to remove.
How can bacteria be eliminated?
At this time, the purifiers typically use a destructive tool - the UV light in the UV lamp.
In addition to this, in the case of gas pollution, the air purifier may also be used in a destructive manner, that is, the combination of UV and a catalyst, specifically named Photocatalytic Oxidation (PCO).
However, when the PCO kills harmful substances, it will cause new pollution and cause eye, nose and throat infections.
Therefore, we must pay more attention to the purchase.
Purification technology
Although we already know the role of various purification tools, how does an air purifier allow air to pass through the filter?
In general, the empty nets on the market use mechanical and electrostatic methods of purification.
Among them, the mechanical type mainly uses high-pressure blowers, while the electrostatic type attracts particles through the electric field. The final purpose of both is to allow the air to pass through the filter and filter out contaminants.
In contrast, the mechanical purification efficiency is high, even up to 99%, but power and noise are also rising.
Electrostatic purification efficiency, though relatively low, is generally around 90% to 97%, but it is more energy efficient and the noise is much lower.
However, there is also a disadvantage in that it generates a certain amount of ozone. As to whether it is within a reasonable range, it depends on which merchant provides it.
Basic reference index
The working principle of air purifiers we have already understood, but you can't judge whether it's good or not by relying on them alone.
You need to refer to several indicators at this time.
The first is CADR, which refers to the rate at which air purifiers provide clean air. So of course, the greater the number, the better.
How much is it right? It is also necessary to calculate the applicable area by the formula CADR x 0.1.
However, CADR is generally enough for 300-400.
After the implementation of the new national standard, we have added a new concept of discrimination, cumulative purification (CCM).
It refers to the state of the filter from the new state to the failure (usually refers to the decay of the CADR value to 50% of the initial value), cumulative purification of the total mass of the target pollutant.
To put it plainly, it means how many dirty things this filter can remove for you.
Because the harmful substances in the air are divided into two kinds of particulate matter and VOC, CCM is also divided into two sets of standards: particulate matter CCM and formaldehyde CCM.
Both sets of standards have four ratings, namely P1-P4 or F1-F4, with Level 1 being the lowest and Level 4 being the highest.
However, for most purifiers, the standard is actually not high, and the general eliminators can reach P4 and F4 (12000 mg and 1500 mg, respectively).
At this point you can view its specific CCM to identify more durable, more efficient air purifiers.
In addition to CADR and CCM, HEPA filters also have industry standards.
The more common is the European norm. The higher grades are H11, H12, and the grades lower than H11 are changed to begin with E, such as E10-E12.
In short, when you buy an air purifier remember to compare these three indicators, or how can you feel comfortable buying?
Not enough to buy against the indicators
I know that some of the above mentioned knowledge may have been heard before, but is it safe to buy these indicators?
The original Xiao Bian also thought so, until I turned to a report of the Ministry of Environment of Korea last year, I learned that a lot of filters have been detected in the body of harmful OIT (octylisothiazolinone, octyl isothiazolinone, octyl isothiazolinone, ).
What is OIT? In fact, it is an antibacterial, mildew-resistant oil-soluble chemical substance.
On some filters that claim to be sterilized, OIT anti-microbial agents may be used to sterilize and prevent the filter from becoming moldy.
But as long as you check the OIT, you will know that it is harmful to the human body, and can cause allergic reactions in the body in direct contact with or through the air.
What's more, it will enter the human body along with the exhaust of the purifier and the air conditioner.
Which air purifier should we choose?
After reading the above lessons, you may find that many air purifiers have their own advantages and disadvantages.
Therefore, we need to choose an air purifier that has a high purification efficiency, but the disadvantages are within an acceptable range.
Then below, Xiao Bian will give you several suggestions:
1. Choose an air purifier with a pulley at the bottom. Whether you are in the living room or in the room, just move it over and you don't need to buy multiple ones.
2. Air purifiers using PCO may cause eye, nose and throat irritation, but if there is no patient with lung disease at home, they may consider buying it.
3. Air purifiers that produce ozone are also not suitable for patients with lung diseases;
4. According to the online evaluation data, the air purifiers of Honeywell, Dyson, Winix, and AeraMax not only excel in purification work, but also do not have the problems we are concerned about. Therefore, it is also recommended by Xiaobian.
5. Air purifiers on the market may also claim to have negative ions, humidification, fragrance, etc. These are functions that are icing on the cake. You can buy them according to your own needs.
Some people say that they have to copy a HEPA filter and they can do a simple evacuation before they are tied to an electric fan. Do you think it is feasible?
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