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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 one 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. Flanders (4 Filters) . 16″ X 25″ X 1″ Precisionaire Nested Glass Air Filter
