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BestAir HW2025-11R Honeywell 20x25x4 Series 2000 MERV 11 Furnace Filter 94.9 out of 5 Stars. 9 reviews BestAir A201-SGM-11R Aprilaire/SpaceGard 20 x 25 x 6 Series 2000 MERV 11 Furnace Filters $34.65 current price $34.65 $90.47