Four Filtrete 20x20x1, AC Furnace Air Filters, MPR 300, Clean Living Basic Dust, 6-Pack (giving 4) exact dimensions 19.69 x 19.69 x 0.81.
https://www.walmart.com/ip/Filtrete-20x20x1-AC-Furnace-Air-Filter-MPR-300-C...
4 AC Furnace air filters (Cap Hill/CD)
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