Amazon.com: X6675 20x25x5 MERV 16 Filter Compatible with Lennox X6675 Healthy Climate Carbon Clean Merv 16 Home Furnace Filter for HVAC System, Part Number HCF20-16, (Actual Size: 19.8 x 24.8 x 4.3
Lennox X6672 Furnace Filters, Carbon Clean Healthy Climate 16x25x5 Air Filter Replacement Merv 16 Filter Media with Homequip Disposal Bag (2 Pack) - Walmart.com
Lowest Price! Lennox Y6606 PCO3-14-16 Filter 20 x 21 x 5