Filterbuy 17x26x4 Air Filter MERV 13 Optimal Defense (2-Pack), Pleated HVAC AC Furnace Air Filters Replacement for Lennox x6664 (Actual Size: 16.56 x 25.94 x 4.13 Inches) - Amazon.com
Lennox X6670 (2-Pack) - 16" x 25" x 5" Healthy Climate HCF16-11 Air Filter, MERV 11 - Walmart.com
16x25x5 AIRx ALLERGY Replacement for Lennox X6670 Air Filter - MERV 11, 2-Pack
MERV: 11 Air Filters at Lowes.com
MERV: 11 Air Filters at Lowes.com
16x25x5 AIRx ALLERGY Replacement for Lennox X6670 Air Filter - MERV 11, 2-Pack
16 x 25 x 5 Air Filters at Lowes.com
Lennox X6670 Pleated Air Filter 16 x 25 x 5 in. | LennoxPROs.com