Facility filters are widely used in Shielded chambers and Defence vehicles. These power line filters reduce EMI noise getting into the system through the power line. The electromagnetic Interferences make system misbehave in operational scenario Hence Power Line EMI filters are used to save sensitive communication equipment kept inside protected communication room from Electromagnetic interference. EMI filters are used at interface of unprotected and protected environment. Available in single line, two lines, three lines and four lines.