This is sort of the anti-fog machine.
I was working a show(major name, I think it was ZZ Top), and at the end, I could hear the fog machines going and going and going. Eventually, the entire concert hall was flooded with fog, the show ended and the doors opened. Fog was even spilling out the doors. It took several minutes(over 10) for the fog to really dissapate sufficiently to safely start bringing down lights and mains.
Now, I'm not hopping on an anti-fog machine bandwagon, although I have stated I'm not really a fan of fog machines, but that is irrelevant. In my uses, I get a puff of fog and then it goes away rather quickly, and have to keep puffing fog rather frequently. It looks silly to me. It seems to me a better utilization is a hazer for the lighting attention, and then use FOG for a FOG effect. At any rate, that's the direction I am going.
Now, there's all this talk of hazers, snow machines, foggers, low-lying foggers, bubble machines and what-not. What about a DMX blower? What if you simply need to move the distractions out of the way? Say, a multi-channel unit: Variable speeds in tiers of 10% per value of 25. Oscillate plus tilt to maximize clearing.
OK, here's my scenario, fairly typical. Although, please keep in mind I've stopped using my fog machines at the moment. I'm doing sound for a wedding, and the band is playing. In the weddings I do, there is typically this big introduction. Well, if I'm using fog for the band, I want the stage more optically clear setting for this segment, mostly as a courtesy to the video and photo teams(I will be offering 4-camera shoots and photography at events, crew availability permitting), since this is a very important part of the event(that and whining about what the bride and groom ordered for courts and getting hammered). So, I typically don't even get a heads-up(language issues, I don't speak their language, literally). Suddently, I notice someone talking and people coming up, and at that point, I'd want to try to clear up the haze/fog as quick as possible.
Any thoughts? I know, fog and haze don't interfere with cameras. I got some great shots of another band, and they had lots of haze going, they started fogging the place up with two large fog machines and fans 4 hours before the event to get a nice even haze everywhere All my shots came out fantastic unless I did something wrong.
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They are nice units I must say and completly dmx compatible, but too expencive for the average dj for sure. Only unscale events such as your recent concert would use them. 