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The “PROMARK” is a company that aim to provide best solution for cleanroom, we make all kinds of air filters and filter equipment such as pre filter, medium filters, HEPA filters, Fan Filter Unit and so on. For making the HEPA filters, we have professional R&D department and QC to control the filter quality, to make sure every HEPA filters give required airflow rate and pressure drop, and to ensure each HEPA filters without leakages.