Aprilaire 213 Air filter are designed for high performance and contaminant-trapping ability. Fits the Aprilaire Model 4200, Model 3210, Model 2210 and 1210 Air Aprilaire 213 Air filter are designed for high performance and contaminant-trapping ability. If you added the Upgrade Kit 1213 to your Aprilaire Model 2200 or Model 2120 you can also use the Aprilaire 213 filter.