Photo 1 of Aprilaire 401 Replacement Filter for Aprilaire 2400, Space Gard 2400 Whole House Air Purifiers - MERV 10, 16x25x6 Air Filter (Pack of 4)

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Photo 1 of Aprilaire 401 Replacement Filter for Aprilaire 2400, Space Gard 2400 Whole House Air Purifiers - MERV 10, 16x25x6 Air Filter (Pack of 4) Photo 2 of Aprilaire 401 Replacement Filter for Aprilaire 2400, Space Gard 2400 Whole House Air Purifiers - MERV 10, 16x25x6 Air Filter (Pack of 4)