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Old 04-13-2012, 06:37 PM   #1
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Default DIY Venturi Cold Smoker

I wanted to cold smoke some malt with oak for a Grodziskie I'm making. After looking around the inter web, I decided to make my own venturi cold smoke generator. This is not a new idea, but I don't think anyone has posted a DIY here on how to do it.

The venturi smoke generator uses a metal jar in which wood chips are placed. A few wood chips are lit to produce a smolder. An aquarium pump is used to drive the smoke out a pipe into a smoker. Since the smoke generator is separate from the smoker, it produces a cold smoke. When you are smoking malt, you want a cold smoke so that you don't get roast characteristics in your grain, just the smoke flavor.

So for my project, I used an old SS cocktail shaker as the jar, a few pieces of 1/2" copper pipe and a few fittings to make the smoke generator.



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Old 04-13-2012, 06:39 PM   #2
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The first thing I did was to drill a hole into the cap of the cocktail shaker and insert a 1/2" copper pipe to 1/2" MIP fitting. I used a 1/2" conduit nut to secure it in place:






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Old 04-13-2012, 06:41 PM   #3
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Here is the cap on the cocktail shaker:


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Old 04-13-2012, 06:44 PM   #4
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I drilled some 1/8" holes on the side of the shaker as a lighting hole. I drilled some holes on the bottom as air vents and I drilled holes and used some nuts as feet to hold the shaker off the ground:





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Old 04-13-2012, 06:47 PM   #5
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Out of the top of the shaker lid I put a small length of 1/2" copper pipe. This went to a tee. In front of the tee was another length of 1/2" pipe that fit into another 1/2" pipe to 1/2" MIP adaptor.
On the back side to the tee was the venturi

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Old 04-13-2012, 06:55 PM   #6
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The venturi was a length of 1/4" OD water line inside of a short length of 1/2" copper pipe. On the end of the copper pipe is a 1/2"MIP to 1/4" compression fitting. The 1/4" water line fits thru the compression fitting and its position inside the 1/2" pipe can be adjusted.





In order for the 1/4" pipe to fit thru the compression fitting, the inside of the compression fitting had to be drilled out with a 1/4" drill bit:





The length of the 1/4" tube is adjusted so that it sits just forward of the tee. An air supply is hooked into the end of the 1/4" pipe and air traveling out of the tube causes a venturi drawing smoke from the shaker thru the pipe

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Old 04-13-2012, 06:59 PM   #7
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To attach the smoke generator to the smoker, a hole is drilled and a 1/2" MIP to 1/2" copper pipe adaptor is attached. Here it is on my UDS:



Wood chips are placed in the shaker. Here I am using oak chips:

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Old 04-13-2012, 07:02 PM   #8
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The lid is placed on the shaker and the aquarium pump is hooked up:






The wood chips are lit using a torch aimed at the lighting holes in the side of the shaker:

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Old 04-13-2012, 07:04 PM   #9
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Here I have taken the pipe out of the UDS so that you can see the smoke generated:

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Old 04-13-2012, 07:07 PM   #10
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Grain is placed on a screen in the UDS. The grain is wetted with water to help capture the smoke:






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