How to clean indoor air?

　　Modern people spend 70% of their time indoors, and winter is usually longer. Viruses are brought into the room by people (pets). The central air-conditioning system can be done in two ways: dilution or disinfection (filtration). The role of N95 masks is to filter virus particles (aerosols to be precise), the efficiency is greater than 95%, remember that it is not 100%. Normal people cannot and do not need to live in a sterile environment, because all drugs are rogue regardless of the dosage. The principle of indoor air purification is that as long as the unit concentration of viruses (bacteria) does not exceed the threshold, the body's immunity can be held.

　　Dilution is the introduction of a large amount of fresh air to control the possible virus concentration indoors at a low level. ICU and operating rooms use fresh air systems for granted, but the cost and operation and maintenance costs are very high. For general indoor use, fresh air is not required. According to national standards, 30 cubic meters per person per hour is already very large. It is recommended to use a full heat exchanger (synchronized intake and exhaust, balanced indoor pressure) or a fresh air unit with cold source and preliminary filtration.

　　Disinfection (filtration) is the treatment of indoor air volume, including negative ions, high temperature, ozone, ultraviolet rays, and HEPA high-efficiency filtration, etc. This article focuses on negative ions (negative oxygen ions).

　　Studies have shown that only dust less than 50μm has the opportunity to float in the air to form suspended particles. The smaller the dust, the longer the suspension time, the greater the possibility of carrying viruses and bacteria, and the greater the possibility of causing harm to the human body. The filtering method is to use a smaller screen to block the dust, but there is not only PM2.5 in the air. , There are PM5, PM10 and even PM50, so what I don’t want to tell you is that it needs to replace the filter. The time may be much shorter than you think. (It should be noted that in the same room, the higher the filter level, the higher the frequency of filter replacement.)

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