The problem is your warm tower. This happens with all cheap kegerators and frankly, they aren't worth installing a fan. They're junk.
If you are using this commercially, just get good equipment.
If you are using this at home keep in mind that there are exactly 5.5 30-packs in a 1/2bbl. If you throw in the cost of cups, kegs are often more expensive than cans.
Bottles / cans are the best bet for home 99% of the time.
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