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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
Note: Lennox MERV 10 filters are now rated MERV 11
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The Lennox X6667 is the correct replacement filter for the following air cleaner models:
The Lennox X6667 MERV 11 Air Filter Media Replacement is a replacement air filter for Lennox Healthy Climate PureAir PCO-20 air cleaners. This box media utilizes a MERV 11 pleated filter that captures particles as small as 0.3 microns in size. With this furnace filter you will be able to trap dust, dirt, pollen, and other pollutants so that you can provide cleaner breathing air for your entire family. Be sure to replace this PureAir filter approximately every 6 to 12 months in order to ensure the best air filtration results.
Lennox X6667 MERV 11 Air Filter Media Replacement specifications: