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Different functions of HEPA filter
The HEPA filter is a filter that can remove fine particles from the air. What kind of fine particles are difficult to block for the HEPA filter?
(1) Small particles of dust with a diameter of 0.1 microns or less will perform irregular Brownian motion in the air due to their extremely small weight, and there will be some differences in the direction of the airflow. So there are more chances of hitting the fiber. This filtering effect is called 'diffusion
(2) The weight of particles with a diameter of more than 0.3 microns is larger, so they are blocked by different principles. When the air stream touches the fibers, the airflow reverses direction, wrapping around the fibers. However, the larger particles, due to their considerable weight, cannot adjust their direction with the airflow, so they will come into contact with the fibers and will be blocked by the fibers. This filtering effect is called 'inertial impact
(3) Fine particles with a diameter of about 0.1-0.3 microns are difficult to block. They follow the airflow easily, wrap around the HEPA fibers, don't touch the fibers easily, and don't sway in the air due to their heavier weight. These hard-to-stop particles are called 'penetrating particles' (MPPS).
The filtering effect of all grades of HEPA filter is calculated according to the filtering effect of MPPS. For example, the filtration effect of the H11 filter is more than 95%; this means that the filtration effect of penetrating particles is not less than 95%, while the filtration effect of particles smaller than 0.1 microns and particles larger than 0.3 microns will be higher.