English to German Tech/Engineering Safety breathing apparatus

The T‐piece has no warning whistle, it is only intended to enable a connection to a rescue airline in an escape situation, e. g. “safe havens”.
The device enables the wearer to escape from a potentially hazardous atmosphere and is equipped with an airline connection for attachment to an air supply in “safe havens”.

danke fuer Ihre hilfe mit diesem Begriff. Ist es eine Sicherheitszone??