I'm new to cold smoking and have just bought the small ProQ Cold Smoke Generator. I'm now thinking of what to smoke in. I've seen really good set ups with oil drums, filing cabinets, and custom built wooden boxes. But as I'm only smoking cheeses, veg, & small cuts, for personal use I just need a small set up. As the generator is supposed to not give out any heat I'm thinking of setting up a couple of racks, over the generator, that can be covered with a medium size cardboard box - Gives me an excuse to keep buying boxes of 12 bottles of wine.so I can renew the used box when I want. A really basic question is whether I need to encourage air flow with a hole/chimney on top, or whether it's best to keep the box as air tight as possible. Any advice on box set ups welcomed. Thanks