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Why We Choose An Air Purifier With Hepa Filter

Introduction

We all know that cleaning the house regularly is very necessary for both our health and our living experience. Most people are likely to ignore the other important thing in our home we should clean. That thing is air beyond the surface. Researches have shown that the air at home can have certain pollutants five times more than outside space. The condition can be worse if you live in a place with a heavy environmental problem such as pollution, sandstorm. etc. That's why we need an Air purifier, which is a faithful guardian for us to prevent the health problems caused by the pollutant air. With the development of technology, unaccountable kinds of air purifiers have sprouted in the market. Among all kinds of air purifiers, we highly recommend the Air purifier with hepa filter. In the following content of this article, we will give our reasons. Also, we will introduce different kinds of air purifiers for comparison. Just read on, you can get what you want about the Air purifier.
After we have gotten some knowledge about what Air purifiers dose, we will list different kinds of air purifiers for you.

Various types of Air purifier

Air purifier with HEPA filter

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HEPA means High-Efficiency Particulate Air. 
The main purpose of a HEPA filter is to remove fine particles from the air, including PM2.5 (fine particles less than 2.5 microns in diameter.) 
HEPA is not a brand or trademark, but an international standard.
The basis of any HEPA filter is 0.5 to 5 micron thick fibers that cross each other. The distance between the fibers is roughly 5 to 50 microns. So, how can a filter with such a large gap block particles of 0.01 to 0.3 microns?

When it comes to the principle of a filter, a funnel comes to mind: when the diameter of the particles is larger than the gap between the fibers, the particles will be stopped by the filter. But this principle is only valid for filters with a relatively low rating. The principle of the HEPA filter is more complicated because the space between the fibers of the HEPA filter is bigger than the particles that are stopped.

HEPA filters rely on the adsorption of fibers to "stick" to PM2.5 dust. The diameter of the fibers is about the same as the dust, and the "mesh" gap between the fibers is even "bigger", and the "wide" space between the fibers allows airflow to pass smoothly. However, due to the arrangement of layers, small particles inevitably hit one of the interwoven fibers and are attracted to it. 
Unlike primary (G) and intermediate (F) filters, particles in a HEPA filter are effectively stopped as soon as they come into contact with the fibers, and never leave the surface of the fibers. This effect is called "interception". Besides, the particles that keep entering the filter will stick to the existing particles as soon as they come into. Therefore, over time, the fibers of the filter will accumulate layers and layers of particles.

Air purifier with Activated carbon filters

Activated carbon is a black amorphous granule or fine powder. According to the material classification, it can be divided into coconut shell activated carbon, fruit shell activated carbon, wood activated carbon, coal activated carbon, and so on. 
Activated carbon granules have a large surface area and are rich in micropores. 
Because of the large surface area of carbon granules, they can be in full contact with gases, which means they have a large adsorption capacity. The total surface area of each gram of activated carbon can reach 500~1000m2, and the activated carbon fiber can reach more than 1500m2. When these gases are adsorbed by the micro-pores, they play a purifying role.
Activated carbon has a selective adsorption capacity for various gases and is suitable for the adsorption of organic gases, such as benzene, toluene, xylene, and carbon tetrachloride, etc. The effect of adsorption on benzene is most obvious, and the adsorption capacity is high up to about 50%.

The activated carbon in the filters of some air purifiers is made of bamboo charcoal, coal charcoal, and coconut shell charcoal. 
They also are pressed into cylindrical or honeycomb shape through treatment, which allows the surface of the activated carbon to as many chemical pollutants as possible without obstructing air circulation. Besides, the activated carbon has a large adsorption area, which can effectively improve the purification capacity of the air purifier. There are two types of activated carbon commercially available, granular activated carbon and activated carbon fiber, which have the same adsorption principle and process.
However, activated carbon can only temporarily adsorb a certain amount of pollutants. After the saturation of adsorption, the adsorbed pollutants may free out and enter the breathing space again, causing secondary pollution. Therefore, this type of air purifier should often replace the filter material to avoid adsorption saturation. 
Under normal environmental conditions, activated carbon has no adsorption effect on carbon monoxide and carbon dioxide; almost no adsorption on formaldehyde, ammonia, and sulfur dioxide, or very low; the adsorption capacity of activated carbon-hydrogen sulfide is only 1%; 
Most of the formaldehyde-activated carbon filters used inside most air purifiers now are modified. After adding materials, the formaldehyde activated carbon filters can react with formaldehyde and other pollutants inside the activated carbon material, which can selectively and efficiently adsorb and purify harmful substances in the indoor environment.

Electronic air purifiers

The core principle of the electrostatic air purifier is that a high-voltage device is set at the air inlet to charge the airborne particles; when the charged particles pass through the built-in dust collection box, they are adsorbed and locked by the positive and negative dust collection plates in the dust collection box, thus achieving the purpose of purifying the air. 
The biggest advantage of this kind of purifier is that it has a good effect on removing very small particles, such as 0.1~0.3 micron particles that are difficult to remove by the filter; secondly, because the dust collection box is generally made of metal, it can be cleaned and used repeatedly, unlike the filter that needs to be replaced, which is also called no consumables.
One coin has two sides. So what is the downside of this electrostatic air purifier? 
First, the electrostatic air purifier will cause serious electromagnetic pollution and ozone pollution
Since the electrostatic purifier needs to use high voltage discharge to make the particles charged, the higher the voltage, the better the effect; 
Generally, the voltage of a house electronic air purifier has to be between several thousand to tens of thousands of volts to power the machine.
High voltage inevitably leads to abnormal electromagnetic radiation around. This electromagnetic pollution is much more serious than the general cell phone and display screen. Besides, high voltage is also likely to lead to ozone generation. 
Secondly, there is no effect on the removal of formaldehyde and other gaseous-type pollutants. 
So many electronic purifiers are advertised with no supplies and formaldehyde removal on the other. This is a contradictory and dishonest statement. 
From the principle of electrostatic dust collection, it is known that only the particles will be charged and adsorbed by the dust collection plate; 
 molecular substances like gaseous pollutants, will not be charged and cannot be absorbed by the dust collection plate. 

Third, the more troublesome problem is dust collection box cleaning. The particles removed from the air are collected in the dust collection box. The material of the dust collection plate is metal with a smooth surface. If the metal surface is covered with non-conductive dust, then it will lose its adsorption capacity. When the machine is not energized for a long time, the dust collection plate and the adsorbed particles will lose their charge and the particles will be emitted to the air heavy again. Depending on the performance of the purifier and the degree of environmental pollution, generally less than a week, more than a month, it needs to be cleaned. For more than one month without cleaning, the purifier will not only fail to purify the air but also pollute the air. 

How to choose an air purifier that is suitable for your condition 

CADR

First of all, what is the CADR value? CADR means clean-air delivery rate. 
The purification efficiency of an air purifier is determined by the fan and air duct design, but these two points are difficult for consumers to judge, so the state regulations require the air purifier providers to sell air purifiers with the mark of CADR 
CADR refers to how much volume of air can be purified per unit of time, and the unit is m³/h. The higher the CADR value, the higher the purification efficiency in the same space.

Size

Mostly, the Size of the air purifier is connected to the place it can purify. You can choose the air purifier with the proper size according to the space you want to use.

Maintenance

 With HEPA filters, it’s unavoidable that some impurities will be stuck in the filters. If you can not clean the filters as the manual advise, the efficiency of purification will be decreased. And the machine will cost you more energy.

Noise

Noise is one of our important points we should take into consideration. Mostly we will use an air purifier for a long time for the best air quality. Nobody wants to be disturbed by the air purifier when working in the office or sleeping at night. 

Conclusion

In this article, we introduce different kinds of Air purifiers, including air purifiers with HEPA filters, air purifiers with activated carbon, and electronic air purifiers. We also share the pros and cons of these air purifiers. Through the content we shared above, you may get the conclusion, Air purifiers with HEPA filters would be better in many conditions. Other than these, we also provide some points you have better consider before purchasing an air purifier. 
We hope this article can help. If you have other questions, please feel free to contact us through E-mail or telephone. 
Thanks for your reading!
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