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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 .
Questions? info@oxyclean.com > Lennox Air Filters > Lennox Carbon Filters
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Carbon Filter X2678 Lennox: Carbon Filter X2678 Lennox:

Lennox X2678 is the correct replacement carbon filter for the following air cleaner models:

Lennox HEPA 20

ONLY: $37.88 each - FREE SHIPPING When You Order Two or More
Carbon Filter X4138 Lennox: Carbon Filter X4138 Lennox:

Lennox X4138 HEPA 40/60 Carbon PreFilter is compatible with the following units:

Lennox Healthy Climate Filtration Systems

ONLY: $39.88 each - FREE SHIPPING When You Order Two or More
Carbon Filter X4137 Lennox: Carbon Filter X4137 Lennox:

Lennox X4137 is the correct replacement pre-filter for the following systems:

Lennox Healthy Climate HEPA 20

ONLY: $44.64 each - FREE SHIPPING When You Order Two or More