Photo 1 of 2-Pack 313 Replacement Air Filter Compatible with Aprilaire, MERV 13 Air Purifiers for Whole House Models 1310, 2310, 3310, or 4300, Size 20x20x4 Furnace Filter

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Photo 1 of 2-Pack 313 Replacement Air Filter Compatible with Aprilaire, MERV 13 Air Purifiers for Whole House Models 1310, 2310, 3310, or 4300, Size 20x20x4 Furnace FilterPhoto 2 of 2-Pack 313 Replacement Air Filter Compatible with Aprilaire, MERV 13 Air Purifiers for Whole House Models 1310, 2310, 3310, or 4300, Size 20x20x4 Furnace Filter