• Frame is made from heavy, moisture-resistant chipboard in a one-piece design that eliminates corner separation. • Filtering media is progressive density, continuous filament spun glass. A resinous bonding agent provides rigidity and resistance to compression. A viscous adhesive increases filtering effectiveness. • These filters have been tested by Underwriters Laboratories Inc., and classified as Class 2 for flammability. Media support is provided on the downstream side only.
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