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Lennox X6664 Furnace Filter (formerly part 75X74) is the correct Replacement for PCO-12C. The nominal filter size is 17 x 26 x 4 with an actual size of 16-1/2" x 25-7/8" x 3-15/16. The MERV 16 upgrade replacement filter is X6666.
Shop Lennox Merv 16 Filter
Lennox X6666 17x26x4 (16-5/8 x 26x 4) OEM MERV 16 Replacement Furnace Filter- 1 pack
- Lennox Part X6666 Genuine OEM Lennox MERV 16 filter
- Fits model HCFPCO-12C.
- Provides near-perfect filtration performance.
- Pack 1
- Dimension 17 x 26 x 4 in.