Air filter

Prototype for air filter is the use of respiratory protection for protection of breathing apparatus. According to historical records, as early as the First century of the Roman people in purifying mercury, protected with masks made from coarse linen. After this long time, air filters have also made progress, but mainly as a risk of respiratory protective devices used in some industries, such as production of hazardous chemicals. 1827 he discovered the motion of small particles, a further understanding of the mechanism of air filter.