Door coordinator

Door coordinators for double-leaf door sets.
The active door-leaf is prevented from closing
by the lock-head of the coordinator. The passive
door-leaf closes first and the coordinator
releases the active door-leaf so both door-leaves
are closed in the correct order.
Active door-leaf: the door-leaf normally used
for passage. Passive door-leaf: the door-leaf
normally not used for passage.
To be installed over the frame, suitable for left or
right-handed doors.