Photo 1 of 2-Pack 310 Replacement Filter Compatible with AprilAire Whole House Air Purifiers Models 1310, 2310, 3310, 4300, MERV 11 Air Purifiers, Size:20x20x4 (Actual size:19.41x19.8x4.02in)

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Photo 1 of 2-Pack 310 Replacement Filter Compatible with AprilAire Whole House Air Purifiers Models 1310, 2310, 3310, 4300, MERV 11 Air Purifiers, Size:20x20x4 (Actual size:19.41x19.8x4.02in)Photo 2 of 2-Pack 310 Replacement Filter Compatible with AprilAire Whole House Air Purifiers Models 1310, 2310, 3310, 4300, MERV 11 Air Purifiers, Size:20x20x4 (Actual size:19.41x19.8x4.02in)Photo 3 of 2-Pack 310 Replacement Filter Compatible with AprilAire Whole House Air Purifiers Models 1310, 2310, 3310, 4300, MERV 11 Air Purifiers, Size:20x20x4 (Actual size:19.41x19.8x4.02in)