Feature 1 Main Application: This pre filter is mainly used for dust removal, working for the later filter. Very practical! 2 Scope of Compatibility: Pre filter is suitable for PreMax pre filter replacement, compatible with for IQAir HeathPro series. 3 Extended Service Life: Replacing the pre filter can extend the life of the powerful filter, providing better using experience. 4 Easy to Replace: Easy to install the pre filter without any additional tools, you can do it in a short time. 5 Ideal Replacement: This pre filter with excellent performance and easy replacement, is an ideal replacement for old or damaged ones.Item Type: Pre Filter Material: Foam, High Efficiency Particulate Air Package List1 x Filter CoreNoteTo 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.