Are there any special requirements for HEPA filters used in healthcare facilities?
Yes. To meet Institute of Environmental Sciences and Technology IEST-RP-CC001.3 standards for Type A 99.97% efficiency HEPA filters, each and every completed filter must be individually tested for leakage and resistance, to detect any leaks in the media or between the media and the frame or other problems that can compromise the integrity of the completed filter. Test results must be shown on a label on the filter frame. Filter frames should be metal. The 2003 CDC Guidelines state that: “Wood (HEPA frames) can compromise the air quality if it becomes and remains wet, allowing the growth of fungi and bacteria,” and recommends replacing these filters with metal-frame filters. Filters should also meet UL900 Class II flammability requirements.
