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Lennox X2678 is the correct replacement carbon filter for the following air cleaner models:Lennox HEPA 20
Lennox X4138 HEPA 40/60 Carbon PreFilter is compatible with the following units:Lennox Healthy Climate Filtration Systems
Lennox X4137 is the correct replacement pre-filter for the following systems:Lennox Healthy Climate HEPA 20
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