How to choose an air purifier HEPA filter.txt

air-purifier hepa-filter txt

The purification efficiency of the air purifier is indicated by CADR. It stands for Clean Air Delivery Rate, and only certifies CADR by institutions designated by the US Industrial Standard (ANSI). The unit is a purification space per minute (m^3/min), indicating how much space can be purified per minute. In other words, it refers to the efficiency of quickly purifying contaminated air in a certain space, and it does not mean that even smaller fine dust can be removed.

Therefore, if you buy an air purifier because of fine dust, what you need to check is the performance of the filter. Grades are divided according to filter performance performance. Grades 10 to 12 are called EPA grades, grades 13 to 14 are called HEPA grades, and grades 15 to 17 are called ULPA grades. The notation is like this. [E10, E11, E12, H13, H14, U15, U16, U17] More than 99.75% of fine dust in the air can be removed from grades 13 or higher.

There is a tendency to think that it is good to have an unconditional high rating, which is wrong. This is because the higher the grade, the greater the resistance (when using the same motor), the less the air volume. Noise and power consumption increase to equalize the air volume using a large motor. (Actually, the noise is causing it to turn on lightly.) If the air volume increases, it is advantageous because the frequency of filtering air increases and a wide range can be covered. The CA-certified area of use is the most important indicator for comparing the performance of the air purifier.

When comparing one air purifier with a large capacity and two small air purifiers, two that can circulate the overall air faster are much better. This is because the range in which the air purifier can actually be purified may be narrower than the marked specifications. In addition, if outside air is continuously introduced due to frequent ventilation or if there is a lot of dust due to frequent indoor activities, it is highly likely that only the area around the purifier will be clean and the farther away from the cleaner, the more it will not be purified. Therefore, rather than placing one large purifier covering 18 pyeong in an 18-pyeong living room, it is much more efficient to clean up the air by placing two small purifiers covering 9 to 10 pyeong away from each other.

For reference, EPA ratings cannot filter viruses in the air, but HEPA ratings and above can filter viruses in the air. Therefore, it is relatively safer when the flu is prevalent. There is a reason why consumers want air purifiers above HEPA grade. For reference, if you check the product specifications of the air purifier that has received the HEPA rating, you can see how many types of viruses and other allergens are removed.

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944 2019-03-17 Lady