Actually I'm talking about a totaly different effect than the fan behind the fogger method.
Check this link out
http://www.electricsuppliesonline.com/airki95piutb.html
With this type of fan (Squirrel cage downdraft design) you lay the fan perpendicular in front of the fogger. Yes, it does gum up the blades over time. But the effect is much more dramatic, as it is not only diffusing the fog (as you would with the fan behind) but it is also blasting out a thinned out haze. And, becuase the fan is much more powerfull than a standard hazer's fan, it is much more instantanious.
Try it, you'll like it....I almost guarantee it