IT168 evaluation With the arrival of autumn, hazy days began to wreak havoc again, the National Day Emperor partner sucked for a week of fog. Although Xiao Bian, who lives in the south, is not as polluting as the emperor, it often covers the haze of the sky. He also asked editorial staff to discuss the problem of starting the purifier. At this time, the village colleagues dried out the purifiers they had just started, absolutely high-end goods. My brother is amazing, this purifier costs nearly 5,000 yuan. However, while the younger friends were looking for their envy, they also quarreled with their colleagues' IQ. To spend so much money to buy international big-name purifiers instead of local products.
When the humidity in the summer falls, the ashes will come back to wreak havoc.
For the ridicule of a group of Xiao Bian, the village co-workers intend to let us experience something and show that the results of the test are not convincing. As for the villagers' efforts to improve their office environment, the small partners were moved to express several more.
US KJ400G-B21 air purifier (hereinafter referred to as the beautiful B21)
The official parameters of the United States B21, particulate matter, formaldehyde CADR values ​​belong to the highest level of the national standard (P4/F4)
Sure enough, it was the product that Murakami took to see. Compared to the rigid exterior design of general air purifiers, the B21 of the United States made people feel the urge to love at first sight. Like a porcelain-like body shape coupled with simple white, in the home as an artwork is not an exaggeration. For the first time, the author felt that the village village is also quite tasteful.
Beautiful KJ400G-B21 air purifier
The first time you saw the B21 of the United States, I believe that you and the author will ask: where is the outlet? Air purifiers should have an outlet, and they should all be located at the top, but there is only a UFO-like control panel on the B21. Saying that this sleek control panel is really beautiful and covered with acrylic material outside, the beauty of the B21 crystal is mainly from this control panel. Described in one sentence, that is the design is very good.
Beautiful KJ400G-B21 air purifier
After the boot, the panel automatically rises, and it feels like this moment is worth the price.
The author is looking around the purifier to find the outlet. After the villager has not seen the face in the Tucao family, he presses a switch on the panel. At this time, the panel lights up and slowly rises. The original panel was a dust-proof panel in addition to the control device. This is to prevent the dust from depositing into the body when the air purifier is not working.
The partner who used the air purifier must have had this experience. Open the machine that was not used for a few days. The gust of wind that had just come out was always a strange taste. It is because the dust collects inside the air purifier body, and when it is turned on again, it is blown out once and it feels so cool.
US KJ400G-B21 Air Purifier dustproof panel
Murakami said that the fully-raised panel has a very important role in addition to being handsome and dustproof. The author also guessed that it is to change the wind direction of the outlet. Different from the normal air purifier's vertical air outlet, the beautiful B21's inclined air outlet design can actively create a circulating air flow in the room, thus driving the purified air to flow elsewhere.
Beauty B21 after raising dustproof panel
In order to make everyone better understand, the author here through the smoke to let everyone see the difference between oblique and vertical out wind.
Leaning out of the air, blowing the purified air to a distance
Ordinary purifiers can only produce vertical airflow, requiring the refraction of the walls to allow the purified air to be carried elsewhere
After seeing the elegant appearance, we are ready to start this Typhoon air purifier. Turning the back side, Midea's B21's air detection sensor, filter element, and humidification tank are all located at the bottom rear.
The B21 of the United States has a tall body of 83CM, and the air outlet and the air inlet are far apart.
Midea B21 has a total of five sensors - laser dust sensor, VOC odor sensor, humidity sensor, humidity sensor and brightness sensor. The first four correspond to the detection of dust, volatile organic compounds, humidity, and temperature in the air. The brightness sensor can automatically control the working status by monitoring the brightness of the environment. For example, after turning off the lights at night, the beautiful B21 will automatically switch to sleep mode.
In addition, the laser dust sensor used by Midea B21 is more sensitive and accurate than the general infrared dust sensor. The multiple sensors work independently, which is also conducive to the timely detection and purification of pollutants.
Sensor air duct entrance behind fuselage
The B21 is equipped with a humidifying function, so it is equipped with a water tank, which is exactly a large water tank. The capacity of this tank is up to 3L, which is about the same level as the mainstream atomized humidifier. The water tank can avoid the trouble of frequently adding water, and my family's silk air purifier always needs to add water.
A small partner may ask, why do we need to humidify the air purifier? Because air humidity is also an important indicator, excessively dry air can easily cause throat problems. After all, in the winter, when the air is dry, the skin will crack, but unlike the skin inside the nose, it can be coated with hand cream or something.
Water tank with antibacterial material
Midea B21 comes standard with a five-layer conforming filter, weighing 1,100 grams, of which coconut shell activated carbon weighs 400 grams. According to official data, the composite filter screen has an area of ​​20,000 square centimeters for the development of the HEPA filter; and 400 grams of coconut shell activated carbon has an adsorption area of ​​400,000 square meters (56 football fields). This resulted in a CA DR value of 405 cubic meters per hour, and a CADR of formaldehyde of 120 cubic meters per hour.
Beautiful B21 filter thickness and 4 cm
Here again, the coconut shell activated carbon used in the US B21 filter is lighter than the coke coal, but the adsorption area is much larger. In addition, cold catalytic catalysts are added to these coconut shell activated carbons, which naturally decompose and adsorb toxic chemicals such as formaldehyde on the top. In this way, the life of the filter will be better and longer, and the adsorption efficiency of activated carbon can also be maintained for a long time.
Filter installation with switch lock to prevent accidents
Well, after some fiddling inside and out, the author still feels very satisfied with the design of B21 . In particular, the automatic lift panel gives people a feeling of full technology. It is said that Muramura likes to present to the visiting guests. However, the air purifier is still purifying, or it is a good-looking vase.
Air purification capacity combat: formaldehyde/TVOC/secondhand smoke
PS: The following test
Formaldehyde and TVOC, I believe many small partners are no strangers to them. That's right, whether it's a newly renovated house or a room with newly added furniture. Although everyone is familiar with it, here is a brief introduction to this pair of live treasures.
Formaldehyde, chemical formula HCHO, colorless gas, has a special irritating odor. I believe that everyone is familiar with this term, high concentrations of formaldehyde are toxic to the respiratory nervous system, immune system, liver and so on. TVOC is a total volatile organic compound, which is a generic name for various organic compounds that can be volatilized into gas at room temperature. The main gas components are alkanes, aromatic hydrocarbons, alkenes, halogens, esters, aldehydes, and the like. Stimulates the eyes and respiratory tract and injure human liver, kidney, brain and nervous system.
Even natural wood releases trace amounts of formaldehyde, which lasts for 2-15 years.
So how do you deal with them? There are many natural methods, and the more commonly used and safe ones are activated carbon adsorption. Therefore, the quality of activated carbon directly determines the purifying capacity of this type of air purifier. In the previous section, we introduced the use of coconut shell activated carbon for B21. Although this activated carbon is light in weight, the same volume has more pores than coke coal, and the actual surface area is much larger than the latter. So the little friends who buy the filter, remember to choose to use coconut shell activated carbon.
In order to create a simulated environment full of polluted air, I bought glue and paint. When I was buying, the author deliberately told the boss that the glue and paint were the worst quality. This time, the author almost pitted himself. He did not think that the irritatingness was so strong. We all remember that this test is very dangerous and you must not imitate it at home.
When I opened the lid, the irritating smell blew on my face. I accidentally took a few mouthfuls. I felt uncomfortable on my throat for a night.
The author who wears an activated carbon respirator mask feels adorable
After putting contaminants for a while, the handheld air detector data in my hands began to stabilize. I thought that formaldehyde would be seriously exceeded, but what I couldn't think of was the TVOC that bursts out of the table. It seems that under the state's vigorous regulation, even the no-name manufacturers are careful about the addition of formaldehyde. TVOC, which is often overlooked by everyone, is seriously overdone. No gas mask can't breathe normally.
Everyone in TVOC usually pays little attention, or not many people will know
Formaldehyde is not good
According to the data provided by the instrument manufacturers, safe TVOC in the air should be less than 0.1ug/L. That's what the author used to test the contaminant, so that the boss's office (12 square meters) exceeded the pollutants 10 times. Yes, it is the boss's office. When the boss is away, we go in and test it. This time the fryer was over, so much so that he immediately started the B21 of the United States, or the boss came back and found that we were deducting wages.
The red light has already turned on. The author has adjusted the air volume to the maximum and turned on the anion function (then he started to slide ).
Purification process
It's really exciting to say that the paint glue that the writer bought has something to do with it. If everyone meets this situation at home or elsewhere, it is safer to leave quickly or open the window for ventilation.
Air purification capacity combat: secondhand smoke
I believe that many small partners do not smoke, but secondhand smoke is sometimes unavoidable, and many families and companies are air purifiers starting with secondhand smoke. Therefore, after testing the formaldehyde TVOC, I intend to test the US's second-hand smoke purification capability.
Smoking is definitely a bad habit. Everyone should not smoke.
I do not smoke, but for everyone to better understand the beauty of the B21 is also a fight, one is the three root, PM2.5 immediately soared
After the PM2.5 detector's numerical explosion, the author wiped out the cigarette. At this time, the boss’s office was filled with smoke.
PM2.5 has fallen back to breathe after 4 minutes
After 6 minutes, the quality indicator of Midea B21 turns yellow
The entire purification process takes 10 minutes
The boss's office is only 12 square meters, so usually when several people smoke together, the smoke taste will not be dispersed. But the United States and B21 demonstrated a good ability to remove PM2.5, which is inseparable from the machine itself strong wind and high efficiency filter strainer.
I want a quiet environment: working noise measured
Midea's B21 uses a DC drive motor. In addition to its cool features of stepless adjustment, it also has good start-up characteristics compared to AC motors. It has low energy consumption but excellent performance, and the efficiency of the reducer is up to 96%. Small noise is low. Since the air purifier is an electrical appliance that is used for a long period of time, its noise level directly affects the user's life experience. Otherwise, everyone is equipped with an industrial purifier. According to the official data, the noise level of Midea's B21 is 35-65 decibels. What is the actual experience?
Ordinary purifier speed control, beautiful B21 stepless speed regulation can obtain more accurate air volume
The maximum wind speed of Midea B21 is 19.5 kilometers an hour, and the air volume is very good
　　 At a distance of 50 cm from the outlet of the machine, the author used a noise meter to measure. Fortunately, the office in the morning is quiet and the ambient noise is less than 42 decibels, which is very suitable for measuring the noise performance of air purifiers.
Environmental noise, office is relatively quiet
From the measured data, the author is still quite surprised. At first, the noise was only 60 decibels at the maximum air volume, which was far below the official figure. Later, I learned that the original B21 noise measurement using the sound power level is 7 dB lower than the common sound pressure level. In other words, U.S. air purifiers use more stringent measurement methods.
50% wind balance between noise and purification efficiency
　　 The noise performance of Midea B21 is very good, especially when it is in sleep mode. Therefore, according to the decontamination ability, the B21 of the United States belongs to a large area (such as a living room). However, from the results of noise tests, the beautiful B21 is very suitable for children, pregnant women, the elderly room.
I want a comfortable environment: air humidification
　　 As I said before, the comfort of the air is also related to the humidity of the air. Dry air not only causes dry throat itch, but also easily causes inflammation of the respiratory tract. In fact, many small partners have water mist humidifiers at home, for example, the author almost has to sleep in winter. However, the shortcomings of this product are also obvious, that is, there are more water out of the fog, in the morning up to a beach of water.
Do not use tap water with this product, otherwise residual chlorine, bacteria, and microorganisms in the water will run into the air.
  Like many high-end air purifiers, Midea B21 is equipped with a humidifier. Unlike the atomization and humidification of humidifiers, Midea B21 uses evaporative humidification and does not see the presence of fog.
The indicator light will flash when the humidification function is turned on
In addition to the unique humidification function, Midea's B21 adds filters and DUV deep UV lamps to the inside of the fuselage, while the sink and tank are made of antibacterial materials.
Beautiful B21 fuselage interior
The actual humidification capacity is also good, the author opened the maximum amount of air after the American B21 filled with water, at this time the humidity in the boss's office is 59%.
The boss's office has been broken by the author
After 15 minutes, the author ran back and looked at it. At this time, the humidity of the boss's office had been raised to 72%.
Humidification stops automatically after humidity exceeds 72%
Edit Comment
First of all, to talk about the overall feeling, first of all, the most impressive B21 of the United States is undoubtedly its design, sleek shape coupled with the dust panel can be lifted, not to mention that the price face is absolutely full. Of course, for a Tyrant air purifier priced at 4,998 yuan, this is also a necessary element. The functionally beautiful B21 is very complete, from basic PM2.5, formaldehyde purification to negative ion sterilization, and humidification. However, its fuselage is very slim and will not be a special place.
Yan value out of the United States Air Purifier KJ400G-B21
In terms of the most important purification capability, the huge outflow from Midea B21 is accompanied by a high-quality filter, bringing about an efficient purification experience. The following is the author's use of a filter on the prototype for more than a month, the color changed from blue to dark gray. The visible dust is blocked outside, and the HEPA filter is discolored by various PM2.5 particles.
Prototype works in a public office area with an area of ​​about 60 square meters
The current high-end air purifier market is more occupied by international brands. The price of 4998 yuan in the United States is no doubt that the B21 provides users with a choice of domestic products. But then again, the beauty of the B21 is still more suitable for high quality consumers like the village.