I have 2 by Beverage air units a little smaller than the one you are looking at and they work great as fermentation chambers or for storing beer, etc. I might use one as a kegerator, but will have to open the door to use the taps.
I don't think that the line run through the side walls like residential units. I am pretty sure that the cold air blows down from the top and nothing is in the foam in the sides or back.
Other than the expense, I think they make some of the best ferm chambers going. Add a pad / flexible sheet heater and a 2 stage Ranco, and you have a perfect chamber. Mine will fit a 12 gallon conical.