A tool system for moulding an article is provided which comprising a tool having a tool surface for forming an article, the tool surface comprising a plurality of tool zones. Wings protrudes from the center segments and are biased to project out of a plane defined between the hinge axes. The cylindrical roller bearings are arranged at two axially spaced supporting positions respectively, and support a radial load applied to the rotating shaft. The fluid-to-air heat exchanger heats airflow through the thermal simulator, with temperature of airflow exhausting from the simulator being tailored to correlate to temperature of the heated airflow exhaust of the electronics subsystem, rack or row of racks being simulated.