ass box is a chamber for passing the operating room operating room to unsterile area . This is helpful; to reduce the particulate contamination inside the operating room. Pass box has two doors which is interlocked with mechanicalelectromagnetic interlocking system. So that we have to prevent both doors from being opened at the same time. UV light and CFL in off condition if any door open CFL will on UV will switch off for dynamic pass boxes laminar air flow arrangement with Blower, Motor and HEPA filters. Hectra range of pass boxes : Static Pass boxesDynamic pass boxesStainless steel (SS) SS304, SS316Galvanized iron (GI)Powder coated