all good idea and some of which I have tried. I do use smaller transformers for my fans, I think around 5 volts is what I settled on, and that does slow the fan down greatly. Depending on the application you really don't want that much fan movement. However in my experience, anytime a fan is remotely close to fog the fan will make contact with the fog and begin condensing. This is where the problems begin to arise. I have tried fans pushing into a bucket with the fog supposedly being vented into another pipe but even that didn't work. Any fan in a tube whether it is at the top sucking or at the bottom blowing, will begin to condensate the fog. The only thing close to having worked is when I had a large single chamber res and just pushed air into it from the top. That's when I started to use lower fan speeds with smaller transformers. The system ultimatly failed though. Any fog system will need supplemental misters to handle the water needs of the plants in my opinion. I'm trying to redesign a system that will allow for fog and misters as needed.