If you cool the fog, it'll stay lower to the floor, being denser. There's a "Halloween Haunted House" web site that has fairly detailed plans for creating such a cooler from a largish ice chest - but you need some dry ice to "power" the thing, as I recall. Basically, you put a couple of holes into the chest; one hole is connected with tubing to the fog machine, the other becomes the exit port. Put dry ice into the chest, and turn on the fog.
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"do you like it and think this is the best you can do with the subject and location and model and equipment?". - Glenn Usdin
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