This kind of primary air filter has a low resistance, high strength. With its aluminum frame and net, the filter has more strength, mainly suitable for high air flow air conditioning and ventilation system pre-filtration, clean room recycling air filtration and filtration device pre-filtration, which mainly is used to filter 5um or bigger particles. According to different requirements, the filter material can be be chosen from sponges, different grades of non-woven fabrics, nanofibers and glass fibers.

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