The Active Gas Handling System (AGHS) of the JET Facilities has been operating in conjunction with the JET machine since it was connected in Spring 1997. Initial estimates of the period of time that the AGHS would be needed to detritiate the machine exhaust gases was of the order of a year. However tritium emanation from the machine and the in vessel inventory has meant that the AGHS has operated continuously since this time. It has therefore been necessary to continue operations whilst also carrying out plant development and maintenance.