So I'm supposed to replace the good old automatic BCF ones with something more "environmentally friendly" - but not exactly engine friendly, it seems. The only ones currently available appear to be powder or foam, which I don't want to use because of the risk of engine damage during an accidental discharge. This is more common than a real fire. Does anybody know who is currently making inert gas filled fire extinguishers? I hear talk of Pyrogen but can't find anybody who sells the stuff.