The title refers to the temperature of 932° F (500 °C) at which a 'flashover', the near simultaneous ignition of all combustible material in an enclosed area, occurs.
Meta Golding, who guest stars as Rachel, would later play Warrick's wife Tina beginning in season six.
The title is a homage of sorts to the classic Ray Bradbury novel "Fahrenheit 451," so named because it is the temperature at which paper burns.