We stock every Dynamic Air Cleaner replacement filter media made. Remember to replace your Dynamic Air Cleaner replacement filter media every 30 days for the best performance you can achieve. When you order the filter media order it based upon the outside dimensions of the actual air cleaner frame (not the dimensions of the filter media). The Dynamic Air Cleaner filter media will be several inches smaller than the air cleaner frame. Our technical support team can assist you should you have any questions about your Dynamic air cleaner. You will find on-line owners manuals on the link above. Remember to replace your Dynamic filter between every 1 and 3 months for optimal operation.