BOX STYLE Replacement for Spacegard 401 (Aprilaire 401) Filter MIN QTY 2. This quality non-OEM filter fits the Spacegard 2400 filter housing. It replaces the Aprilaire 401 (Spacegard 401) OEM filter. This filter carries a MERV rating of 8 (MERV Rating of OEM part is 10). Nominal size: 16x28x6 (actual size: 15 3/8″ x 26 15/16 x 6)
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