This part of ISO 11933 specifies the design criteria and the characteristics of various components used for ventilation and gas-cleaning in containment enclosures. These components are either directly fixed to the containment enclosure wall, or used in the environment of a shielded or unshielded containment enclosure or line of such enclosures. They can be used alone or in conjunction with other mechanical components, including those specified in ISO 11933-1 and ISO 11933-3.This part of ISO 11933 is applicable to: - filtering devices, including high-efficiency particulate air (HEPA) filters and iodine traps; - safety valves and pressure regulators; - systems ensuring the mechanical protection of containment enclosures; - control and pressure-measurement devices. NOTE The elements constituting the framework of containment enclosures (e.g. metallic walls, framework and transparent panels) are dealt with in ISO 10648-1.