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Home Brew Forums > Home Brewing Beer > DIY Projects > Other > DIY Venturi Cold Smoker
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Old 04-13-2012, 07:08 PM   #11
geniz
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Put the lid on the UDS, and in a couple of hours, smoked malt.


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Old 04-13-2012, 07:23 PM   #12
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I love this idea. I am finally enjoying a smoked lager that I made back in November. I may have to try this for my next smoked beer. Thanks for sharing!!!


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Old 04-13-2012, 08:36 PM   #13
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So the aquarium pump was not powerful enough to push smoke out of the UDS. I changed the aquarium pump to a nebulizer on a variable voltage control. A lot of smoke at the level of the grain now:

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Old 04-13-2012, 08:37 PM   #14
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Here's a pic of the UDS.



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Old 04-13-2012, 08:40 PM   #15
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Temp in the UDS at ambient temp



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Old 04-14-2012, 01:01 AM   #16
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Pretty Cool.
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Old 04-14-2012, 09:20 AM   #17
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This youtube video gives a great explanation on how to build a venturi cold smoker.

http://youtu.be/frSrfMjjC3M
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Old 04-14-2012, 02:14 PM   #18
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That's very slick. Do you think a smaller grain chamber with venting would draft well enough to use an aquarium pump?

I used a tailgating grill as a second chamber on top of a buddy's smoker with a few elbows. It worked fairly well as the temp stayed below 100 but the capacity is limited and there are 0 points for aesthetics on my solution.

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I used a couple $1 stainless steel lint traps cut open and sewn on with stranded copper links to hold the grain. It took a jiffy pop looking tin foil ring to get 3lbs of malt to fit under the lid.

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Were you able to get a couple hours of smoke with your cocktail shaker or did you have to reload?
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Old 04-14-2012, 03:41 PM   #19
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That looks like a good build. Functionality always wins over aesthetics. The aquarium pump I got was not very powerful. You can get high flow pumps which I think could be powerful enough to fill a large chamber like an UDS. I had a nebulizer sitting around so I didn't want to go back and spend $30 for a larger pump. If I had used a smaller vertical smoker, the small aquarium pump would have been fine. The problem with the small pump and UDS is that all the smoke stayed at the bottom of the UDS. There is no heat, so no convection to pull the smoke up out of the UDS smoke stack. The nebulizer just barely running forced the smoke out of the UDS.

I ran the smoker with the aquarium pump for an hour and a half without refilling it. When I hooked up the nebulizer I refilled the shaker with chips and ran it for another hour. With the aquarium pump I could have easily run the smoker for two hours without refilling. Probably could have gotten close to that with the nebulizer.

The lesson I learned was to get a good sized aquarium pump if you are gonna fill up a large smoker.

BTW that was 8 lbs of wheat malt in the smoker
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Old 04-16-2012, 12:41 PM   #20
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Cool thanks. Unfortunately it won't function very well once my buddy takes his smoker back. I'll probably reuse an existing aquarium pump and live with a smaller chamber to try a DIY venturi.

Are you brewing same day with the cold smoke malt? A lot of the home smoke malt posts say to wait but they're all pretty much higher temp BBQ rigs.


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