Originally Posted by SmokingDog
Thinking about how a freezer cools (from the floor and walls), I would think that ducting the cold air supply from the bottom of the keezer (room permitting) would be optimal. A small section of drier exhaust hose.
The bottom is where the coldest air is, no doubt. My experience was that I just couldn't move/direct enough air to keep all of the shanks at the right temp. The one nearest the cold output would be quite cold, but further along the row, the temps varied. I tried using wyes to aim and direct it and wound up with something analogous to a 'tubing octopus'
I think that 'room permitting' is the most important aspect. A hose when cold is very brittle and hard to position and move. Plus, the box wastes real estate that could be put to better use.
By simply placing a high volume fan where the coffin meets the lid, I was able to do away with hose, box, and octopus and fit another keg. To me, this just seemed easier than dealing with the alternatives.
If you are able to get it working, please record your temps and post back here. I wouldn't want to dissuade anyone from trying things, the original post was about showing the shortest (and hopefully, cheapest) route to solving this problem.