How Air Filters & Air Quality Products Effect Viruses like COVID-19LegacyAc
Below is a list of the most common Indoor Air quality products for residential homes. We are trying to gear this to answer the questions on the benefits that each product does provide, but also let you know how it might affect the Covid-19 disease and your chances of getting it.
Can an Air Filtration System Protect from Covid-19?
Ultimately no matter what filtration system you have, 它过滤任何病毒的唯一方法是，如果你或你认识的人首先把病毒带进你的家里. If you were truly being as careful as some suggest, such as washing your hands and changing your clothes every time you leave the house, 我们认为你会把它带回家的另一种方式是不幸地在你的肺里. No filtration system will clean your lungs, 如果你的鼻子或嘴巴是病毒藏匿的地方，所以请非常小心，因为你的钱和时间最好花在确保你外出时有个人防护设备，如一次性手套, hand sanitizer, wipes for things like gas pumps and door handles, and a mask (preferably N95 or better).
Standard filters are unlikely to be of much assistance in capturing viruses of any sort. The viruses are too small and pass easily through the gaps in the filters. 如果病毒或细菌刚好碰到过滤器，就有可能被过滤器捕获, so use gloves when removing an old filter and place it directly into a sealed trash bag. Remove it from your house and set in in your outdoor garbage can.
Types of Air Filters and Their Effectiveness Against Viruses Like Covid-19
High Efficiency Air filters
There are HEPA like filters that can capture particles as small as 2 microns. They will filter out most dust particles, allergens, pet dander, and mold. 大多数病毒都太小了，除非它们通过直接撞击过滤器中的纤维而被困住, 然后，很可能至少有一部分病毒会通过，继续进入气流分配系统. Even true HEPA filters will only filter out completely microns down to .3 microns with 99.97% efficiency rate. Since viruses are much smaller than this they can pass through even true HEPA filters. Hospitals are usually the primary purchasers of true HEPA filters, but even they do not rely solely on these filters to clean and sanitize their air.
How HEPA filters work for Covid-19
Again, the virus is small enough that it can pass through the filter. Some of the virus may get caught in the filter, but we cannot sell this product under the banner that it will protect you from Covid-19
Electronic Air filters
Electronic air cleaners work by trapping most particles traveling by your air in a prefilter. Anything that gets past the prefilter goes to an electrically charged filter. 由于体积太小而无法被预过滤器捕获的污染物会被电子空气过滤器充电，并被吸入过滤器部分的相反电荷板中. Some electronic filters will have another portion that creates ozone. 臭氧发生器产生的氧分子会附着在污染物上，如霉菌孢子和细菌，并将其消灭.
How Electonic air filters work for Covid-19
According to the Journal of Natural Science, Biology and Medicine, 产生臭氧的产品可以杀死冠状病毒，并被证明对SARS(另一种与Covid-19相似的冠状病毒)有效。. 在哪些地方，臭氧已经对许多病毒进行了测试，当暴露在臭氧中的数量和时间足够时，它可以同样有效地破坏或摧毁多达99%的病毒细胞. Ozone has not been tested specifically on Covid-19, though, so we cannot say definitively that it will kill this new virus.
What the EPA Says on the Effectiveness of Ozone
The EPA says the following about the effectiveness of ozone, “一些数据表明，当臭氧存在时，低水平的臭氧可能会降低空气中的浓度，并抑制一些生物有机体的生长, 但是，臭氧浓度必须比公共卫生标准所允许的高5 - 10倍，臭氧才能充分净化空气，防止臭氧被去除后生物体的存活和再生(Dyas), et al.,1983; Foarde et al., 1997).”
在美国和其他地方有许多不同版本/类型/制造商的紫外线灯. They all work under the same basic principle. They bathe surfaces in UV light at a particular distance and with enough time, can kill viruses such as SARS and MERS. The key point here, though, is time. It takes time under UV light for the UV rays to damage the DNA sequence and kill the virus. 家庭中的紫外线灯是固定的，安装在气流中的某个地方，永远不会直接照射到人身上. Just like too much UV light from the sun can damage your skin, man-made UV lights will cause harm to a person when exposed to it for any length of time. They are very good at killing viruses, mold, and bacteria on a stationary surface such as a wet evaporator coil. 如果我们想想像covid - 19这样的病毒是如何在一个空气以400-450立方英尺每分钟的速度传播的管道系统中传播的, 当病毒经过管道系统中的光时，固定的紫外线没有时间杀死病毒.
How UV lights work for Covid-19
如上所述，它们已被证明对中东呼吸综合征和非典等病毒有效(这些也是冠状病毒). Although UV light has not been proven to kill Coronavirus as of the date of this article, 它很有可能在足够的时间和适当的距离内杀死病毒. 已经说过得到适当的距离和杀死病毒所需的光线也会做很多伤害你自己,所以你应该从来没有试着自己或一个表面紫外线消毒,你也会接触到. UV lights have a place in sanitizing ducting or equipment evaporator coils, but that is because they will never expose people to harmful rays. 它们在清除管道系统中的病毒方面不是很有效，因为它们不太可能暴露在紫外线下足够长的时间，从而造成损害.
Here again there are many different manufacturers for air scrubbers. The Aerus Air scrubber uses what they call ActivePure Technology to sanitize the air. Here is a chart to show you how long it takes to clear specific contaminants.
这个系统的工作原理是空气中微小的氧和水分子进入净化装置，并通过活性纯蜂窝基质. While inside this unit, the molecules are turned into powerful oxidizers that are released back into the airstream. 这使得氧化剂能够附着在空气和室内表面的污染物上. The oxidizer then kills many contaminants including such things as E. coli, Staph, Strep, the avian Bird Flu, and the Swine Flu within 6 hours of treatment in most cases.
这个系统相对于其他系统的优势在于它能释放出挥发性有机化合物(VOC)杀死分子并将其攻击到它们所在的地方，而其他系统则必须依靠HVAC系统将污染物带到它们那里. There are also commercial 模型将产生臭氧，也可以在空气中旅行，消除更多的污染物.
How Air scrubbers work for Covid-19
Like all of the products listed in this article, this one has not been tested specifically on Covid-19. We feel like it has more advantages and opportunities to kill viruses, bacteria, mold, 和其他的挥发性有机化合物作为它用来杀死污染物的产品，也是通过空气传播的，可以到达污染物所在的地方. Some of these models also include UV lights for a little added protection. Of all the products we feel this has the highest value, but it is also the most expensive.
How Effective are Air Filter Systems Against Covid-19?
Key points/advice to our customers
- Most of these products are effective in some way against coronavirus type viruses, 但并不是在所有的应用中，除了一种应用外，所有的应用都依赖于风管，既能将病毒带到它们身上，又能让它们在适当的位置停留足够长的时间来杀死它们. This is a highly unlikely scenario.
- 室内空气质量对您的整体健康非常重要，我们强烈推荐其中一些产品来改善您的室内空气质量, but we don’t think you should think of them as a way to prevent you from getting the virus
- Above all else educate yourself on the product you are being pitched. Use common sense. If it sounds too good to be true it most definitely is. Don’t panic buy toilet paper, canned goods, or IAQ products.
另一件需要考虑的事情是，许多这样的产品，如高效空气过滤器(或任何高效过滤器)，将会限制你的气流. 静压读数必须在安装前进行，并且经常需要对管道进行修改，以保持系统正常运行. If the static pressure (resistance to airflow) gets too high, your systems components such as the compressor and ECM motors can fail prematurely. 除了熟悉产品和您的暖通足球外围前十平台系统的人之外，不应该尝试安装上面列出的大多数东西.
Please feel free to call us anytime for more information.