Photo 1 of (Pack of 2) 310 Filter Replacement, MERV 13 20x20x4 Inches, Compatible with AprilAire Air Purifiers, Fits Model 1310, 2310, 3310, or 4300 (2)

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Photo 1 of (Pack of 2) 310 Filter Replacement, MERV 13 20x20x4 Inches, Compatible with AprilAire Air Purifiers, Fits Model 1310, 2310, 3310, or 4300 (2)Photo 2 of (Pack of 2) 310 Filter Replacement, MERV 13 20x20x4 Inches, Compatible with AprilAire Air Purifiers, Fits Model 1310, 2310, 3310, or 4300 (2)