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The Lennox X8309 is the correct replacement filter for the following air cleaner models:
The Lennox X8309 MERV 10 Expandable Filter Replacement is a replacement expandable filter for the Lennox PMAC-20C model air cleaner. This pleated air filter measures approximately 16x25x5 and boasts a MERV 10 rating for the reduction of airborne particultes, such as dust and fine particulates, in your home air down to one micron.
This collapsible media filter features enhanced UV resistance for long filter life and also maintains increased bonding in order to prevent air leaks. With this Healthy Climate furnace filter you will be able to improve your indoor air quality.
Lennox X8309 MERV 10 Expandable Filter Replacement specifications: