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?Filtration efficiency rating G4~F8 is available for selection
?Using special low-resistance and high-throughput composite fabric of synthetic fiber as the filter material, with a high dust containing capacity
?The filter can be with the frame made up of aluminum alloy, galvanized steel, stainless steel or plastic
See more at: http://www.hefilter.com/Air-filters/HBM-Synthetic-Pocket-Filter.shtml