Aprilaire 210 Air Filters are designed by Aprilaire for best efficiency and performance.Aprilaire 210 Air Filters fit the Aprilaire Model 1210 Air PurifierHigh-efficiency MERV 11 ratingGenuine Aprilaire Self-Seal #210 ensures the best performanceChange Aprilaire 210 Air Filters FrequentlyThe replacement filter 210 can also be used with the Aprilaire Model 1210 Air Purifier to remove finer particulate from the air stream for those suffering with asthma or allergies.