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This 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. for peak equipment protection and energy efficiency, these filters should be changed monthly in periods of high use. Buy a case and be set for the year.
Lasts up to 30-days
Change filters monthly for peak energy efficiency
Low airflow resistance
UL class II
Self-retaining media adheres directly to the frame