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The Lennox LX18 is the correct replacement air filter for the following humidifier models:
The Lennox Foam Humidifier Filter LX18 is a replacement foam filter for the Lennox WSI-18 furnace mount humidifier. This two pack of Lennox foam prefilters measures 14" x 12 3/4" x 1/2" and reduces mineral pollutants within your WS1-18 humidifier model.
Lennox Foam Humidifier Filter 2pk LX18 specifications: