Don't run your air cleaner with a dirty filter! This long-lasting replacement charcoal filter is designed for years of dependable service. Trust JET-branded filters to provide the high quality and guaranteed performance necessary to keep your equipment operating at peak efficiency. The JET® AFS-1B-CF Replacement Charcoal Filter features a 3.95-square foot pleated filter with a minimum efficiency reporting value (MERV) rating of 11, meaning this filter excels at trapping particles between 1 and 10 microns in size. Perfect for a smaller home shop, the long lasting, high quality disposable outer filter matches your AFS-1000B air filtration system.