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The Flat Panel EZ Flow is a standard grade furnace filter of the same type that has been protecting furnaces and central air conditioners around the world for over 50 years. The filtering medium is continuous filament spun glass. The frame is made with 1 continuous piece of chipboard to guard against corner separation and is strengthened by a metal retainer (1-sided metal reinforcement on air exit side). Maximum air flow. Alleviates strain on equipment. For peak equipment protection and energy efficiency, these filters should be changed monthly in periods of high use.