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BestAir 25-in W x 20-in L x 5-in MERV 11 MERV: 11 Pleated Air Filter in the Air Filters department at Lowes.com
MERV: 11 Air Filters at Lowes.com
Amazon.com: Lennox X6673 20 x 25 x 5 Inch MERV 11 Efficient Air Filter Replacement for Healthy Climate HC11 Air Purifier Cleaner Purification Systems (3 Pack) : Home & Kitchen