Actual Dimensions: 20.1 x 21.1 x 5. Accumulair brand: 21x21.5x5 Trane BAYFTAH21M2 compatible whole house filters, exactly engineered to replace original brand Trane BAYFTAH21M2 air filters. Fully built so no forming or combs needed. MERV graded to ASHRAE standards assuring particulate filtration as good or better than the name brand Trane BAYFTAH21M2 filter. Note: Sample air filter picture shown is not the actual dimensions and is there to show configuration purposes only. Name brands and Trane BAYFTAH21M2 P/N displayed for filter style purposes only.
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