|Coolant tower and generator|
Coolant towers were buildings found on a series of several smaller platforms tethered together in geostationary orbit on Char. They were still operational, despite the zerg infestation, keeping the core temperatures stable.
Raynor's Raiders attacked the platforms and destroyed each of four coolant towers and their generators in order to cripple the zerg air support. Each time a coolant tower was destroyed, the individual platform blew up shortly thereafter.