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The Lennox X4137 is the correct replacement pre-filter for the following systems:
The Lennox X4137 HEPA 20 Carbon PreFilter Replacement is a replacement carbon pre-filter for the Lennox Healthy Climate HEPA 20 Filtration System. This carbon pre-filter is the first stage of the HEPA 20 filtration process. This air filter removes larger particulates from the air and prolongs the life of the HEPA filter. With a MERV 6 rating, this unit is an essential component of your Lennox air cleaner and has a service life of 12 months.
Lennox X4137 HEPA 20 Carbon PreFilter Replacement specifications: