EMI(electromagnetic interference filters), also called RFI Filters or radio-frequency interference filters. It is a device that is installed at the power entry point of an equipment to reduce unwanted noises below circuit operational levels, as well as to meet commercial and military international EMI standards. We provide a wide range of EMI Filters for all AC and DC applications, including commercial, industrial, military, tempest and facility/SCIF. Premier Filters, Inc. 952 N. Elm Street Orange, CA 92867 (657)226-0091