Photo 1 of AprilAire 313 Replacement Filter for AprilAire Whole House Air Purifiers - MERV 13, Healthy Home Allergy, 20x20x4 Air Filter (Pack of 1)

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Photo 1 of AprilAire 313 Replacement Filter for AprilAire Whole House Air Purifiers - MERV 13, Healthy Home Allergy, 20x20x4 Air Filter (Pack of 1) Photo 2 of AprilAire 313 Replacement Filter for AprilAire Whole House Air Purifiers - MERV 13, Healthy Home Allergy, 20x20x4 Air Filter (Pack of 1)