Fog Chiller

Posted by qwindelzorf on January 10, 2006

Why did you do this?

Seemed like a good idea at the time, and I had nothing better to do that afternoon. I already had the smoke machine, and I wanted a nice ground-hugging fog for Halloween. To get the type of fog I wanted (about ankle deep), I needed to cool the smoke as it came out of the machine. I looked around online for inspiration, and ended up basically ripping off Allen's design.

Parts

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You will need a moderately sized trash can, and about 20 feet of aluminum dryer exhaust duct. Now, I know that dosn't look like 20', but trust me, it is. Those little 3' pieces each stretch out to about 8' long. As for the trash can, I just found one that I liked. Round helps. You will also need some metal duct tape (not duck tape).Oh yeah. You'll also need a smoke source (duh!). I ordered mine online for about $30. Pretty basic: you put fog juice in the top, push the button, and smoke comes out.

Tools

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Only one really. You'll need a jigsaw, or some other type of saw capable of making a round hole. A large hole-saw would work well, but I already had a jigsaw. A pair of tin snips is also nice. If you don't have some, you should go to the hardware store and get some. They can cut almost anything.

Construction

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First, figure out where you want the holes. You'll probably want one on each side of the trash can. I just held the duct up and traced around it with a permanent marker.

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I found it useful to drill a starter hole so I had a place to begin cutting with the jigsaw. You don't have to, but I would recommend it.

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Now, stick the jigsaw in the starter hole and just follow the line. Pretty straightforward. Don't even know why I bother to mention it.

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Next, you have to join the duct pieces together. I did this by cutting a slot in the end of one piece, stretching it over another, and taping it all up. It worked out just fine for me. When I was buying all the parts though, I saw that they had little aluminum joiner rings. If you want a slightly more professional joint, get a couple of those and attach them with pop rivets or screws.

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Now, cram it all into the trash can. Feed one end through one of your holes, then spiral the duct around inside the trash can. When you're about out of duct , feed the remaining end down through the middle and out the other hole.

Testing and Aftermath

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All that's left to do now is test it. I ran the initial test without any ice. When you want to produce a good shallow fog, pour about 25 pounds of ice into the garbage can with the duct work.