【正确答案】There are four main differences. (1) First of all , backdraft does not happen often at fires as flashover does. (2) The second difference is that backdraft is an explosion; flashover is not. (3) The triggering are different. Backdraft: a ventilation induced ignition of the gases. Flashover: a heat induced development of the fire. (4) The stage of fire growth in which they occur are different. Backdraft explosions occur during the growth and decay stages Flashover only occurs ih the growth stage of a fire and signals the end of the growth stage.