Gantries can be either manually operated or powered (generally 24v d.c.) constructed from aluminium. They incorporate a foot brake devises that need to be operated before the unit can be moved. All Fischer gantries have built in Man-safe fall arrest system.
This Gantry is parked ‘Off Roof’ so that it cannot be viewed from below:

Gantry being installed on a roof:

Installation Gantry:
