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Why Do Air Conditioners Need To Be Equipped With Air Purifiers?
Aug 01, 2018

The hot summer has arrived, many families will turn on the air conditioner, but even if the air conditioner filter has been carefully cleaned, can the air blown out by the air conditioner be clean?

The samples before and after air conditioning cleaning were basically contrasted in the mold culture dish.

In the hot summer, the most comfortable thing is to hide at home and turn on the air conditioner. However, how many people are thinking about cleaning and disinfecting them when they enjoy air conditioning? Otherwise, the air conditioner will blow out invisible bacteria, fungi, and even make a bowl of white rice moldy within 72 hours.

Recently, a number of disease control agencies conducted on-site household air-conditioning household surveys in Shanghai, Beijing, and Shenzhen found that 88% of the total number of air-conditioning fins exceeded the standard, 84% of the total number of air-conditioning fins exceeded the standard; the air-conditioner fins detected the highest bacteria Up to 1000 times more.


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According to experts, in addition to a large amount of dust, air conditioners also have pathogenic bacteria such as aphids, bacteria and fungi. During operation, the bacteria and fungi inside the air conditioner, especially the heat sink, are sprayed out with the air outlet, and enter the human body with the respiratory tract, which may easily lead to dizziness and fatigue, and even suffer from respiratory diseases such as colds, rhinitis and asthma. Therefore, many air-conditioning diseases are not caused by alternating hot and cold, and pollution in air conditioners is also a source of disaster.


How many pollution sources are hidden in household air conditioners? Recently, the laboratory staff went into the ordinary households, observed, sampled, and sent to the laboratory for training. The results of the experiment were remarkable.


[Experiment 1]

Air conditioning, 72 hours of mildew, a bowl of rice

Experimental purpose: Test whether the air conditioner will cause pollution.

Experimental procedure: Take two bowls of the same amount of white rice and place them on a table under the wall-mounted air conditioner, one of which is covered. Close the doors and windows and turn on the air conditioner. After 72 hours, the covered rice was only slightly discolored, but the bowl of rice that was exposed to the air conditioner had long hair and found large mold spots.

Citizen's question: Just before the air conditioner was turned on in June, I just cleaned the filter with detergent and water. Why is this still the case?

Experts dispelled doubts: Zhang Liubo, chairman of the disinfection branch of the Chinese Preventive Medicine Association, said that after using the air conditioner for a period of time, there are deposits of dust and dirt on the surface of the outer cover and the filter screen, which is easy to clean. But the most concentrated part of air-conditioning bacteria - heat sinks are often overlooked.

As the core component of air-conditioning cold and heat exchange, in addition to accumulating dirt and dust, the heat sink also breeds a large number of germs under the action of condensed water. In addition, when the air conditioner is turned on, the doors and windows are usually closed, and the air does not circulate, especially in the summer, which is hot and humid, and the bacteria are more likely to breed.

 

[Experiment 2]

Air conditioning heat sink hides a lot of bacteria

Experimental purpose: Observe how much dirt is trapped on the air-conditioning heat sink by the naked eye.

Experimental process: Select a household wall-mounted air conditioner that has been used for more than 3 years and has not been cleaned this year. Open the air conditioner cover and expose the filter net to see a thick layer of dust and sample with a cotton swab and paper towel. Remove the filter, you can see the black and black air-conditioning heat sink, it seems that there is not much dust, but use a cotton swab to scrape on the heat sink to scrape the black-gray floc. Sampling with a white paper towel reveals a large amount of dirt on the heat sink.

Citizen's question: Is there any pathogen in the black floc?

Experts dispel doubts: Zhang Liubo introduced that professional health institutions have found that a large number of bacteria and fungi are hidden in the household air-conditioning heat sink, and the average number of colonies is as high as 4,765 per square centimeter. The pathogenic bacteria mainly include mold, Legionella, Staphylococcus aureus and other bacteria. When the air conditioner is running, the pathogenic bacteria on the heat sink are sprayed out with the air outlet, entering the human body, easily causing dizziness and fatigue, and even suffering from respiratory diseases such as colds and pneumonia.

 

Weather hot and humid bacteria are easy to breed

According to Prof. Tian Dexiang, Honorary Chairman of the Indoor Environment and Health Branch of the Chinese Society of Environmental Sciences, there will be a lot of mites, molds and germs on the air conditioner fins that are idle for a long time, because people can't visually judge the cleanliness of air-conditioning winds with the naked eye, so household air conditioners The pollution is easily overlooked.

Tian Dexiang pointed out that when the air conditioner is running, a large number of pathogens on the heat sink are ejected from the air outlet and diffuse into every corner of the room. When people stay in the air-conditioned environment for a long time, they will feel dizziness, fatigue, and decreased immunity. In severe cases, they will suffer from respiratory tract. Infectious diseases, etc.


Inhalation of harmful gases by infants is 2 times that of adults

In an air-conditioned environment, the health of infants and young children should be of particular concern. Tian Dexiang said that when the baby is quiet, the amount of air intake is twice that of an adult. Children between the ages of 0 and 6 grow rapidly, and the damage caused by environmental poisons poses a great risk of persistent and irreversible dysfunction.


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Recommendation: Summer air conditioning should be cleaned in January, and it is imperative to install an air purifier.

In the environment of turning off the power and ventilation, evenly spraying the professional cleaner on the heat sink can solve the problem of heat sink contamination. It needs to be allowed to stand for a while after cleaning, in order to make the disinfectant fully function.

As for the frequency of air-conditioning heat sink cleaning, it should be thoroughly cleaned and disinfected before turning on the air conditioner in spring and summer. In summer, air conditioners are frequently used. It is recommended that families with conditions should clean the air conditioner once a month to avoid air-conditioning pollution.

 

In addition, some outdoor pollution will enter the room. In the dust at home, there will be pollutants on the heat sink. The general air conditioner will not remove PM2.5. In addition to cleaning the air conditioner regularly, the key is to rely on good ventilation in the room. At this stage, the outdoor air quality of many cities is not optimistic. Install indoor air. Purifiers may not be urgent.