> The heaters take a significant time to reach operating temperature.
> I'd imagine this is impracticable for a security system, so it
> would be interesting to see if the output is instant when triggered.

I remember seeing a video of a demonstration unit a some show or other, and=
 the glass walled room that was around 12 foot square as I recall, was fill=
ed with an opaque cloud in around 2-3 seconds.

This looks like a similar unit ...
http://www.smokemachines.com/SmokeScreen.htm

US Patent mentioned here
http://www.patentstorm.us/patents/5394139/description.html

Both found by gargoylling 'intruder smoke'


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