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The filtering principle of HEPA filter
The filtering principle of HEPA filterFiltering principle of HEPA filter:Dust particles in the air may move with the inertia of the airflow, move irregularly, or be moved by some field force. When the dust particles in the air hit the filter, the attraction between the particles and the surface of the high-efficiency filter makes it adhere to the filter. The filtering efficiency of the high-efficiency filter for 0.3μm dust in the air can reach more than 99.99%. Therefore, according to the above principle, the high-efficiency filter only has the function of filtering dust; it will neither produce microorganisms nor filter microorganisms. When replacing the high-efficiency filter, it is better to let the test personnel who use it be present (inquire about the bacteria used in the test in advance). Those with external injuries on their hands and bodies are not allowed to operate. The operator must wear a gas mask and rubber gloves. The removed filter should be immediately sealed and placed in a material bag, and then placed in a carton. The used masks and gloves are also handled in the same way and then burned together. When installing a new filter, do not casually extend your head and body into the device, and also be highly cautious in operation. In addition to using high-efficiency filters to sterilize exhaust air, combustion devices can also be used to achieve this purpose. It is unreliable to sterilize exhaust air with ultraviolet lamps. Half of the bacterial overrun problems that occur in operating rooms after a period of use may be due to high-efficiency filters, and there may also be other management problems, such as unqualified regular cleaning. At this time, the root cause of the problem can be found by replacing the high-efficiency filter. |
