Factors affecting the filtration efficiency of air scrubbers HEPA filters

When discussing the core of air scrubbers high-efficiency air filtration technology - HEPA filters, we have to deeply analyze its powerful filtration efficiency, which is a key indicator to measure its performance. The filtration efficiency of HEPA filters is usually defined as the proportion of particles of a certain size in the air that the filter can capture and remove under a certain air volume.
The filtration efficiency of HEPA filters is affected by many factors, mainly including the following aspects:
Fiber material and structure: The filter material of HEPA filters is usually made of ultrafine fibers, and the diameter and arrangement of these fibers directly affect its filtration capacity. The finer the fiber, the tighter the arrangement, the higher the filtration efficiency. In addition, the pleated design of the filter material can increase the surface area, improve the filtration efficiency and reduce the wind resistance.
Wind speed and load: The filtration efficiency is also affected by wind speed and load. As the wind speed increases, some particles may penetrate the filter due to inertia; at the same time, as the filter load increases, its filtration efficiency will gradually decrease. Therefore, during use, it is necessary to regularly check and replace the filter to ensure its continued high-efficiency filtration performance.
Particle size and properties: Particles of different sizes and properties present different challenges to filters. For particles smaller than 0.1 microns, they are captured primarily through diffusion, while for particles larger than 0.4 microns, they are captured primarily through interception and inertial impaction. HEPA filters are particularly good at capturing particles around 0.3 microns, due to the combined effects of their fiber structure and airflow dynamics.