Photo 1 of 2 Pack Y6604 20x26x5 MERV 16 Air Filter Replacement, Compatible with Lennox Y6604 for PureAir PCO3-20-16 Air Purification System, MERV 16 Furnace Filter for HVAC Systems

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Photo 1 of 2 Pack Y6604 20x26x5 MERV 16 Air Filter Replacement, Compatible with Lennox Y6604 for PureAir PCO3-20-16 Air Purification System, MERV 16 Furnace Filter for HVAC SystemsPhoto 2 of 2 Pack Y6604 20x26x5 MERV 16 Air Filter Replacement, Compatible with Lennox Y6604 for PureAir PCO3-20-16 Air Purification System, MERV 16 Furnace Filter for HVAC Systems