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21x26x4 (21.25x26x4) Lennox OEM MERV 10 PCO-20C Replacement Filter

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Lennox Part #X6667 Genuine OEM Lennox MERV 10 replacement filter

• Nominal size 21" x 26" x 4" (Actual size 21 1/4" x 26" x 4")
• Fits model #PCO-20C.

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