Dicko is correct, the fridge will require some ventilation as you need the smoke to draw through it. A shutter is a good idea so you can regulate the amount of flow. If making a separate fire is an issue for you then try a smoke generator like the Smokai, they work well and are pretty hassle-free.
Keep in mind there are two methods of smoking - cold and hot. A fridge might not be suitable for hot smoking so you're limiting yourself a little bit. While you can do a lot with cold smoking there are times when you might wish to hot smoke as well.
Once you get your fish recipes sorted you'll find you'll also enjoy smoking other meats. For example, I rapidly moved on to curing my own bacon and smoking it - with absolutely stunning results. The options are limitless. You'll realy enjoy it.
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