detailed
(The primary filter is suitable for the primary filtration of air conditioning systems. It is mainly used to filter dust particles above 5μm. The primary filter has three styles: plate, folding and bag. The outer frame material has paper frame, aluminum frame and galvanized iron frame. The filter material includes non-woven fabric, nylon mesh, activated carbon filter material, metal mesh, etc. The protective net has double-sided sprayed iron wire mesh and double-sided galvanized wire mesh.)
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