If I was a more intelligent replica owner I might spring for the system that Danny has, nit no - I took the poor-man's route and bought the Blaze Cut which, in all honestly, is unproven but should work quite well and besides..... I have that extinguisher bottle hung in my door opening as a back-up. We had two extinguishers in every school bus my dad put on the street and over 25 years we used five of them, each time to put out someone else's car fire. Not to say you shouldn't have one on board - YOU SHOULD!
In my past life I was involved in Data Centers (DC) full of servers (computers) and storage systems (wicked big disk systems the size of three refrigerators ). ANY customer was terrified of a DC fire not because of the fire, per se, (they all thought that their overhead water sprinklers would take care of that, silly people) but really because of loss of company/customer data and subsequent revenue. Water sprinklers would put the fire out (eventually) but the servers and storage (with YOUR credit card data or transaction data on them) would be dead because the water would simply destroy them (like what happens when you fall into your swimming pool while cleaning it and forgot to leave your cell phone in the house - oops). So everyone running business DCs of any size back in the 1990's went to highly efficient Halon foggers and intelligent sensors to trigger them.
How good were they? Take a look, from our friends at Kidde:
More modern systems work the same way, by excluding oxygen from the fire for several minutes, but they have migrated away from Halon to less carcinogenic gasses so the DC operators don't have to race out of the DC when the foggers go off.
BTW: Many of the new foggers do not produce a gas that is visible so they add stuff to it to make it visible, kind of like adding stinky stuff to natural gas so people can actually smell it.
Pretty cool, huh?