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BestAir 25-in W x 16-in L x 5-in MERV 11 MERV: 11 Pleated Air Filter in the Air Filters department at Lowes.com
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Lennox X6670 MERV 11 Box Replacement Filter also for Honeywell, 16" H x 25" L x 5" W (3-Pack) - Amazon.com
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X6670 Lennox OEM Merv 11 Filter Media 16"X25"X5" Fits X6660 HCC16-28 Genuine Lennox X6670 (2 X Pack of 2) - Amazon.com
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