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To solve air filter's configuration issues for all customers,plate filter has the following types :1.Efficiency: G2-F6 2.Frame: cardboard/ aluminum/ galvanized sheet/ ABS 3.Filter material is flat or be folded as ripple shape. 4.Material: DE series filter cotton/ glass fiber felt/ nylon net Widely used in pre-filtration and exhaust filtration of various clean ventilation systems.