I routed my beer lines (BevSeal 235) around the inside of my collar. This keeps them out of the way when switching kegs. It also allows great airflow around the lines, which keeps them cold.
My fan is located on the bottom of the freezer, below the shank area, blowing upward. You can just barely see it in the bottom right of the photo. I get about 1degF difference between bottom and top.
My lines are about 7' long. I get great pours even though the lines are considerably shorter than than the calculators and conventional wisdom say they should be. I attribute this to some built-in resistance due to the right angle shank adapters, and some resistance from the flow control device in the faucets (even when wide open).
For normal pours I have the flow control wide open, I only throttle it down when filling bottles or growlers. I close the flow control after a pour as insurance against my cat knocking a faucet handle when I'm away. On the Intertap faucets the flow control will completely shut off the flow.
So far I've been very pleased with how well all this works.
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This is a great picture for me as I'm working on building my keezer. I actually just bought 4 of the right angle fittings so I can do some thing similar.