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Ultra-Low Resistance Positive Liquid Trough HEPA Filter, H13 Grade, 99.97% Filtration Efficiency, Ideal for Large Conference Center Ventilation Systems, Find Details and Price about Air Filter HEPA Filter from Ultra-Low Resistance Positive Liquid Trough HEPA Filter, H13 Grade, 99.97% Filtration Efficiency, Ideal for Large Conference Center Ventilation Systems - Shandong Lanqingyuan Purification Technology Co., Ltd