<P> Rollover (also known as flameover) is a stage of a structure fire when fire gases in a room or other enclosed area ignite . Since heated fire gases, the product of pyrolysis, rise to the ceiling, this is where a rollover phenomenon is most often witnessed . Visually, this may be seen as flames "rolling" across the ceiling, radiating outward from the seat of the fire to the extent of gas spread . </P> <P> Rollover is not the same as flashover, although it may precede it, and the terms may be confused . In the case of rollover, only gases present in the room, not the room contents, ignite . </P>

A phenomenon known as flameover is also known by what other term