Photo 1 of 2-Pack 310 Filter Replacement Compatible with AprilAire 310 Whole House Air Purifiers Models 1310, 2310, 3310, or 4300, MERV 11 Furnace Filter Replacement, Size: 20x20x4(Actual Size 20.47'x19.25'x4)

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Photo 1 of 2-Pack 310 Filter Replacement Compatible with AprilAire 310 Whole House Air Purifiers Models 1310, 2310, 3310, or 4300, MERV 11 Furnace Filter Replacement, Size: 20x20x4(Actual Size 20.47'x19.25'x4)Photo 2 of 2-Pack 310 Filter Replacement Compatible with AprilAire 310 Whole House Air Purifiers Models 1310, 2310, 3310, or 4300, MERV 11 Furnace Filter Replacement, Size: 20x20x4(Actual Size 20.47'x19.25'x4)