Containment refers to the physical isolation of a process or a piece of equipment to prevent the release of the hazardous material into the workplace.[1]:13 It can be used in conjunction with ventilation measures to provide an enhanced level of protection for nanomaterial workers. Examples include placing equipment that may release nanomaterials in a separate room.[2]:9–11[9] Standard dust control methods such as enclosures for conveyor systems or using a sealed system for bag filling are effective at reducing respirable dust concentrations.[4]:16–17