Durable construction for all types of industrial and commercial applications|Progressive density glass or poly filter media|Heavy duty frame and corners for added strength and durability|Environmentally friendly|Easy to install|The air entry side is composed of open coarse fibers, while the air exit side is made up of tighter fibers, this dual density media configuration allows for proper depth loading and full utilization of the filter media|Each fiber is coated with a non-migrating adhesive to enhance filter performance|Utilizes a one-piece moisture resistant craft board frame for strength and ease of installation|The interlocking miter corner of the Koch C&I filter provides extra strength and durability|No extra metal support is needed making the filter more environmentally friendly|A thermoplastic sealant is used to bond the filter media to the frame on both the upstream and downstream sides of the filter, bond eliminates any air bypass and helps provide rigidity to the filter

ASHRAE/HARDI Approved