Walt-I have two different hose lengths, one goes about six inches inside the box the other reaches down to the smoker box. The smoke is cool enough that it tends to fall rather than rise in the box. I got the longer length primarily so that I could introduce smoke reliably into my grills.
Brian-I already considered this and plan to convert an unused kegerator for this purpose, simply running the hose into the hole in the freezer lid that the spigot now occupies. The kegerator is a small chest freezer that I converted using a different temperature controller so there is lots of refrigeration capacity. If you plan on converting a dorm fridge be careful that you do not drill into any refrigerant lines in the side walls- I have done this and ruined a freezer. Incidentally, thanks for all your helpful tips on this forum.