Environmental Health
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| HEPA Filters - http://www.hepafilters.com/ HEPA (High Efficiency Particulate Air) filters can remove as much as 99.7% of particles with a size of .3 microns. The website describes the history and development of these filters and also defines what they are and how they differ from other filters. It also provides a list of manufacturers who use HEPA filters in their products. - [Read more] |