[Matt W]

From wikipedia (Quoting the Defense Intelligence Agewncy)

"The [blast] kill mechanism against living targets is unique–and unpleasant.... What kills is the pressure wave, and more importantly, the subsequent rarefaction [vacuum], which ruptures the lungs.... If the fuel deflagrates but does not detonate, victims will be severely burned and will probably also inhale the burning fuel. Since the most common FAE fuels, ethylene oxide and propylene oxide, are highly toxic, undetonated FAE should prove as lethal to personnel caught within the cloud as most chemical agents."



I don't know if this helps, but the "Modern Firearms" website has this this description of the real-world 93mm thermobaric RPG-7 or RPO-A warhead

"The blast effect of the thermobaric / FAE RPO-A warhead,which contains about 2.2 kg of Fuel-Air Explosive is roughly equivalent to the blast effect of the 107mm / 4" HE artillery shell. Upon explosion, RPO-A warhead generates the cloud of high-temperature flame (blast) which is about 6-7 meters in diameter(blast radius 3 meters or more). The blast cloud lasts as long as 0.4 seconds, thus allowing for significant incendiary effect in addition to the massive pressure wave (typical HE explosion lasts much shorter)."

What rules do you need?