Back in the 1940s, during World War II, military factories that produced high-end weapons found that the yield of their products and parts was relatively low. After research, it was found that the bad products were related to the dust particles in the air in the production environment, so the earliest air purification research was started!
Since then, the application of air purification has become more and more extensive. Lithography workshop, high-precision processing workshop, large-scale integrated circuit production workshop, pharmaceutical workshop, high-grade hospital ward, operating room, food processing workshop, cosmetics production workshop, etc. More and more clean production workshops (dust-free workshops) are being built.
In 1960s, Envirco Company of the United States produced a product FFU, that is, a fan filter unit, which was used for dust-free and aseptic treatment in the operating room! It can be regarded as the prototype of the air purifier now!
My earliest work unit after graduation was to produce purification workbench, air shower room, laminar flow hood and other products. One year, a colleague of mine got married, and he joked that he would give them a laminar flow hood to cultivate the next generation. Now it seems that the joke at that time became a reality.
Of course, the air purifier used in industry, in fact, its filtration efficiency, air volume and other parameters are much higher than those of the air purifier on the market now, and each item has its strict requirements, from design to construction to completion test!
There is really no need to use such strict air volume and filtration efficiency for the current household air purifier! After all, they are civilians. But when we choose an air purifier, we still mainly refer to the air volume and the filtration efficiency of the filter screen! In view of the fact that the efficiency of the filter used by most manufacturers is similar, the air volume index is particularly important!
Besides, don't buy a few: 1. Ozone appears, 2. Ultraviolet light (ozone will also appear), and 3. High voltage discharge ionization purification technology. These are harmful to human health in themselves!