Dalamar
Member
Here's a safety notice on City Theatrical's site from the compressed gas association. I'm yet to find a documented death. But there are plenty of warnings like that from fairly reliable and official looking places.
Thankfully, there are no casualties reported from using CO2 in a theatrical environment, and, frankly, I would expect nothing less than professional caution every time CO2's involved.
That said, your problem is, in my opinion, easily solved.
a) MDG ICE FOG Q, a low lying fog generator, when prepared accordingly, can be operated with Liquid N2 instead of L-CO2.
b) Once its fog is warmed up, contrary to many other products out there, the fog vanishes completely, instead of rising up and mingling with your atmospheric effect: that's the whole point, isn't it?
c) I laughed at the "heavy socked actors" comment, but that's not entirely a bad idea.
d) a Full Dewar (Liquid refrigerated CO2 or N2) will provide enough fluid for ~70mins, if the tank is a 230 liters (~3 liters per min). You’ll also use 2.5 liters of MDG Low Fog fluid / hour. Use that to calculate your budget.
That said, I agree that using that much fog, for that long, is going to distract the audience to almost being annoying and defeat the purpose of the effect. But please, don’t take my word for it. I’m no director…
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