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.