X5424 Healthy Climate PMAC-20C, Expandable Air Filter Media 25 x 20 x 6 Inch (19.75x24.5x6), MERV 16$$Tools & Hardware Other

Nominal Size: 20 x 25 x 6 MERV 16 Genuine OEM Lennox replacement filter (X5424) Fits models PMAC-20C MERV 16 microglass filter provides near-perfect filtration performanceYou may also like Furnace Filter No. 75X67 (PCO-20C) 2 Pack Special$$Tools & Hardware Other.