HVAC.com
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Honeywell TRN2621T1 - 21" x 26" x 5" MERV 10 Trane Perfect Fit Replacement Air Filter
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Honeywell TRN2621T1 (3 Pack) - 26" x 21" x 5" MERV 10 Trane Perfect Fit Replacement Air Filter
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Lennox X6667 - 21" x 26" x 4" MERV 10 Pleated Air Filter for PCO-20C
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Lennox X6669 - 21" x 26" x 4" MERV 16 Pleated Air Filter for PCO-20C
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Lennox X8344 - 21" x 26" x 4" PureAir PCO-20C MERV 16 Upgrade Kit without Insert
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Lennox X8345 - 21" x 26" x 4" PureAir PCO-20C MERV 16 Upgrade Kit with Insert
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Lennox X8348 - 21" x 26" x 4" PureAir PCO-20C MERV 10 Maintenance Kit with Insert
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Lennox Y4591 - PureAir 1st Generation to 2nd Generation Conversion Kit: PCO-20C MERV 16 with Insert 21" x 26" x 4"
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Lennox Y4592 - PureAir 1st Generation to 2nd Generation Conversion Kit: PCO-12C MERV 16 with Insert 21" x 26" x 4"
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Lennox Y4593 - PureAir 1st Generation to 2nd Generation Conversion Kit: PCO-20C MERV 10 with Insert 21" x 26" x 4"
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Lennox Y4594 - PureAir 1st Generation to 2nd Generation Conversion Kit: PCO-20C MERV 10 with Insert 21" x 26" x 4"
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Trane BAYFTAH26M (2-Pack) - Perfect Fit 5" Replacement Air Filter 26" Width