Simplex/ Duplex Guillotine Isolators are constructed of austenitic stainless steel or high nickel alloys, depending on the operating conditions. The Guillotine Isolators are designed to seal against both continuous landing bars in the duct framework. The Guillotine Isolators is capable of giving a sealing efficiency of 99.95%. The Simplex/ Duplex Guillotine Isolators ensure complete safety for maintenance personnel working in an isolated section.