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The Lennox X5804 is the correct replacement air filter system kit for the following air cleaners:
The Lennox X5804 HEPA 40/60 Air Filter System Kit is an air filter system kit for the Lennox HEPA 40 air cleaner. This Healthy Climate kit includes one pre-filter, four inner filters, and one O-ring. This air cleaner kit wil help the Lennox Healthy Climate HEPA 40 Filtration Unit remove particles and bioaerosols down to 0.3 microns and improve overall indoor air quality.
Lennox X5804 HEPA 40/60 Air Filter System Kit specifications: