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The Lennox X8790 is the correct replacement filter for the following air cleaner models:
The Lennox X8790 MERV 16 Air Filter Replacement is a replacement air filter for the Lennox PCO14-23 PureAir Air Filtration System. This furnace filter measures approximately 20x21x5 and features a MERV 16 rating. A higher MERV rating results in higher filtration quality. With this pleated filter you will be able to capture dust, dirt, pollen, and other pollutants as small as 0.3 microns. This PureAir filter is genuine Lennox product and should be replaced every 6 to 12 months for the best results.
Lennox X8790 MERV 16 Air Filter Replacement specifications: