Gas Safe
HRT U/S
JUNCTION
HRT D/S
ADIT
Ready / TM verified

Air quantity m3/min

Current—
Required—
NEXT:Tunnel checks complete
Ready / TM verified

Air quantity m3/min

Current—
Required—
NEXT:Tunnel checks complete
Ready / TM verified

Air quantity m3/min

Current—
Required—
NEXT:Tunnel checks complete