Lennox Genuine OEM MERV 16 Media Filter X6669 (21x26x4) Fits PureAir Filtration System Models: PCO-20C, HCFPCO20-16. DO NOT INSTALL this filter with the 10M35 bulbs.
Actual Dimensions: 21-1/4 x 26 x 4"
Also fits the Healthy Climate 16 Air Cleaner
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