Each physical element can be characterised by one or several safety functions. By default Ventilation is always included to each facility and room as a physical element with Filtration as a safety function.
To add a safety function, right click on the Safety functions node (is placed in Base configuration under the Physical elements node in each facility, room and area) and in the context menu choose Add Safety function item. In the displayed window, type a name of function and press OK.
The description of element can be given in the Properties and Links panel.