Thanks for the input!! I know absolutely nothing about this. I assume a chiller hooks on to the end of the fog machine?? I saw the long pipe on the link that was posted. We're trying to fill the entire backyard w/fog (approx 45' x 45'). We have an 8000 cu. ft. unit. Will the chiller pipe eventually fill up the entire backyard or do we need to run long pipes everwhere? Sorry if I sound stupid, I'm totally new to the whole fog machine thing......
That's a lot of square footage to cover. The bigger problem will probably be wind blowing the fog around and away - always an issue. The machine you have can probably give a good blast right from the nozzle, but you'll lose some of that force going through a chiller. I built one of these chillers a few years ago for a 700W fogger and was happy with the result:
Fog Machines - Your Guide to using Fog Machines for Halloween
Since it's a straight-through chiller design, it's not as efficient as one that routes the fog through the ice cubes or that uses a long length of flexible metal piping coiled in an ice-filled trash can. But it will allow the cold fog to blast out a further to get better coverage for your large yard. You can also play with the location of the fogger to get better dispersion. It sounds like you'll need to some higher-end fog juice, too - that "Low-Lying" fluid will dissipate pretty fast. If you can, water the ground where the fog will be going; the water evaporation cools the ground and helps keep the fog from rising. And if the cost isn't too much, get some dry ice, ~10-15 lbs, and break it up into the ice cubes in the chiller. Low-lying fog guaranteed.