Performance characteristics of the initial effect composite mesh filter produced by Wucheng Dingxin Environmental Protection Co., Ltd. 1. The filtration efficiency of ≥5.0 μm particles is 40% ~ 60% 2. Special puffed high-throughput and low-resistance non-woven fabric is used as the filter material, large dust capacity 3. Galvanized frame, aluminum alloy frame, paper frame should be 0202 1. Central air conditioning and centralized ventilation system pre-filtration 2. Large air compressor pre-filtration 3. Clean return air system 4. Pre-filtration of local high-efficiency filtration device 5. Air filter, stainless steel frame, filtration efficiency of 250-300℃