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Environmental control units designed to protect the environment of a closed space (e.g., a shelter) from chemical and/or biological agents and from breathing of radioactive particulates; they do not offer protection from radiation.. These units typically provide heating, cooling, ventilation, and filtration of contaminating (e.g., chemical, biological) agents and/or radioactive particles; they usually provide a pressurized air protection of the internal environment. The equipment frequently includes a standby electric power plant, a heat exchange unit, a compressor, filters, and a control device. Chemical/biological agent protection environmental control units are used mainly to protect the environment in shelters and other installations in a contaminated area.
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