Space Gard is also known as Aprilaire Furnace Filters. Reaches 99% efficiency on particles 5 microns or larger. Reduces dust buildup. High efficiency filter media collects small dust particles before they can collect on your coils. Fits Research Products Model No. 5000 (Part #501) New aftermarket Aprilaire 501 filter!! Original accordion type design. Package contains 2 Filters. Protects heating an
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