GeneralAire 4551 20x25x5 MERV 11 Cartridge Media Filter for MAC 2000

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Replacement Filter Media. This filter has a MERV rating of 11. Approximate dimensions are 20 x 25 x 5. Replace every 6 months if you have heating & cooling OR every 12 months if you only have heating. If you have a dusty environment or shedding pets you may need to replace your filter more often. NOTE: This item replaces part 4501.