Flexible frames are available for applications where a rigid frame cannot be used. Flexible framed filters have a 1/2" polyester layer and an resin stiffener applied between 2 layers of polypropylene and a polypropylene webbing frame which is sewn around the edge. These 5/8" thick filters fit most 1" applications.

The 0.12 inch W.G. initial resistance of the FLEX 94 will perform best in systems configured with 1 square foot, or more, of filter area for each ton of air conditioning.