Item Type: Pre Filter Material: Foam, High Efficiency Particulate Air Package List 1 x Filter Core To improve the performance of your air purifier, replace the carbon filter every 8 to 24 months.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1Main Application: This pre filter is mainly used for dust removal, working for the later filter. Very practical 2Scope of Compatibility: Pre filter is suitable for PreMax pre filter replacement, compatible with for IQAir HeathPro series. 3Extended Service Life: Replacing the pre filter can extend the life of the powerful filter, providing better using experience. 4Easy to Replace: Easy to install the pre filter without any additional tools, you can do it in a short time. 5Ideal Replacement: This pre filter with excellent performance and easy replacement, is an ideal replacement for old or damaged ones.