Commercial and Industrial Disposable Panels are economical air filters designed for light-to medium duty air filtration applications and are constructed for high performance and durability. Polyester Media (White). A dual-layered high performance media for applications where synthetic filter media is specified. Sturdy One-Piece Frame. Utilizes a one-piece moisture-resistant craft board frame for strength and ease of installation. The interlocking miter corner provides extra strength and durability. No extra metal support is needed making the filter more environmentally friendly. Specialized Sealant. A thermoplastic sealant is used to bond the filter media to the frame on both the upstream and downstream sides of the filter. This bond eliminates any air bypass and helps provide rigidity to the filter.