New HEPA filters with plastic frames
German filter specialist Freudenberg is now using plastic as a frame material for HEPA filters. The new framing technique (patent pending) offers all the advantages of both metal and wooden frames. The new filters are distortion-resistant, micro-biologically inactive, unaffected by moisture and even lighter than comparable aluminium-framed filters, which facilitates handling and installation. At the same time, users benefit from their complete incinerability, hitherto provided only by HEPA filters with wooden or MDF frames. To protect the typically sensitive HEPA filter medium, the filters can be supplied with protection grids made of plastic, featuring a honeycomb-type material with flow-straightening effect. Initially, the new HEPA filters are available in an overall depth of 78 mm and a wide choice of front dimensions (up to 1220 x 1220mm or 915 x 1830mm) in the filter classes H11, H13 and H14 to EN 1822 (up to a collection efficiency of >= 99.995 % for MPPS). As of October 2003 the plastic-framed filters will also be available in overall depths of 150mm and 292mm. The pleated filter medium used in Freudenberg HEPA filters is produced with a patented thermal embossing process, where conical dimples in the filter medium serve as spacers, enabling pleat depths of up to 280mm to be achieved without any additional separators. The thermal embossing process also ensures a particularly flow-friendly V-shaped pleat geometry and thus a small pressure drop plus low-turbulence downstream airflow.
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