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Actual sizes vary depending on brand. 5" depth is really
4 3/8, or 4 3/4, or 5 1/4 .
 > Lennox Air Filters > Lennox 20x21x5 (20x20 5/8x4 3/8) - X8790
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Lennox Filter Lennox Filter - Air Filter, Furnace 20x21x5 (20x20 5/8x4 3/8) MERV 8, X8790, AfterMarket

Lennox Filter - Air Filter, Furnace For Models: X8790

Fits Lennox model numbers PCO14-23

Nominal size 20x21x5
Actual size 20" x 20 5/8" x 4 3/8"

ONLY: $35.84 each - DUE TO CANADA FIRES AND A LABOR SHOTAGE LEAD TIME IS 3-4 WEEKS
Lennox Filter Lennox Filter - Air Filter, Furnace 20x21x5 (20x20 5/8x4 3/8) MERV 11, X8790, AfterMarket

Lennox Filter - Air Filter, Furnace For Models: X8790

Fits Lennox model numbers PCO14-23

Nominal size 20x21x5
Actual size 20" x 20 5/8" x 4 3/8"

ONLY: $41.35 each - DUE TO CANADA FIRES AND A LABOR SHOTAGE LEAD TIME IS 3-4 WEEKS
Lennox Filter Lennox Filter - Air Filter, Furnace 20x21x5 (20x20 5/8x4 3/8) MERV 13, X8790, AfterMarket

Lennox Filter - Air Filter, Furnace For Models: X8790

Fits Lennox model numbers PCO14-23

Nominal size 20x21x5
Actual size 20" x 20 5/8" x 4 3/8"

ONLY: $43.21 each - DUE TO CANADA FIRES AND A LABOR SHOTAGE LEAD TIME IS 3-4 WEEKS

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Lennox ODOR DEFENSE Air Filter OXYCLEAN AIR FILTERS with ODOR DEFENSE® Lennox Air Filter Replacement 20x21x5 (20x20 5/8x4 3/8) X8790

Genuine OXYCLEAN AIR FILTERS with ODOR DEFENSE®

Lennox Filter - Air Filter, Furnace For Models: X8790

Fits Lennox model numbers PCO14-23

Nominal size 20x21x5
Actual size 20" x 20 5/8" x 4 3/8"

ONLY: $48.15 each - DUE TO CANADA FIRES AND A LABOR SHOTAGE LEAD TIME IS 3-4 WEEKS