The Tier1 Replacement for Aprilaire 213 Air Purifier Filter (2-Pack) is a high performance MERV 13 air purifier compatible for Aprilaire model air cleaners 1210, 2210, 3210, and 4200. The collapsible pleated fabric filter media is easily installed to keep your HVAC equipment running at top efficiency. The Tier1 Replacement for Aprilaire 213 Air Purifier Filter (2-Pack) specifically reduces, dust, pet dander, and more. Order today!