Time back in many years ago, the first HEPA filters were developed for the Atomic Energy Commission during World War II for use in facilities manufacturing components for the Manhattan (atomic bomb) project. With the development of science and technology, HEPA filter has developed very mature and it has been widely used even in our daily life. The portable HEPA filters used today are much more efficient and economical than before. Today we mainly talk about how to design portable HEPA filter to make it more efficient.
How to design Portable HEPA Filter? First and foremost, the ultra-fine, glass-fiber medium captures microscopic particles that can easily pass through other filters by a combination of diffusion, interception and inertial impaction. To qualify as a Type A HEPA filter, the filter must capture at least 99.97% (9,997 out of 10,000) of particles 0.3 microns in size–about 300 times smaller than the diameter of a human hair, and 25 to 50 times smaller than we can see. To a HEPA filter, catching a one-micron particle (1/1,000,000 of a meter) is like stopping a cotton ball with a door screen. All models are equipped with Compact HEPA Filters that are tested and certified to remove 99.97% of particles that are 0.3 microns and larger, to provide "operating room clean" filtered air. To put this in perspective, the diameter of a human hair is 50 to 200 microns, and fungal spores are typically five to 25 microns. For a complete list of particulate contaminants and odors that the Portable Air Scrubber can remove, please Contact Us with your fax number.
What's more, manufacturing a filter with HEPA Filter media does not mean that the filter itself meets true HEPA efficiency requirements. Serious filter leakage can go undetected if filters are not individually tested and certified at the end of the manufacturing process. Even the tiniest pinhole leaks in the media or breach of the seal between the media pack and the filter frame can cause the filter to fail IEST requirements. The testing requires very specific procedures using a thermally generated mono-dispersed aerosol and a laser particle counter. Some regulations also require field-testing by the user prior to going into service and periodically thereafter.
In the USA, OSHA safety standards for general industry and construction and the National Electrical Code require testing and listing (certification) of electrical products to applicable standards. It is important to note that this testing must be performed on an electrical device even if the individual electrical components used in that device are all listed or approved. Testing must be done by an OSHA-recognized NRTL, such as UL (Underwriters Laboratories), ETL (Environmental Testing Laboratories) or CSA (Canadian Standards Association). Therefore the Portable HEPA Filter have to be designed well to reach these standards. Portable HEPA filters from hefil are of high quality and efficiency. We are professional HEPA filter manufacturer which has got a good word of mouth around the world. We know how to design a high quality portable HEPA filter. If you are interested, you can visit www.hefilter.com for more information.
