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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Bionaire APF20 Filter is the washable pre-filter for the Bionaire BAP336-MU Everfresh Air Exchange System. The Bionaire Everfresh Air Exchange System is an easy-to-install window unit that cycles in clean, fresh air, while cycling out undesirable odors and allergens.
(This system requires an APF-18 Electrostatic Filter, an APF-19 Washable Pre-Filter, and an APF-20 Washable Pre-Filter.)