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The panel filter selection from Grainger includes 2-ply ring panel and 3-ply polyester panel filters and M3 make up panel filters. Use 3-ply filters for high humidity and all HVAC applications. Ring panel filters trap a small percentage of particulate, so use them in lighter duty applications where there is minimal dust or particulate in the air. A sturdy internal wire is heat sealed inside the polyester layers of these panel filters, creating a self-gasketing filter. Choose from a wide range of sizes when you shop for a panel filter at Grainger.