WaterPog:
For my temporary hookup with the Hayden 1676, I had the Hayden attached outside the two 120mm fans on the back panel of a LiteOn FS020 case, (had a 1-inch wide cardboard ring "duct" between it and the fans which were blowing out of the case through the duct and Hayden, all held together with duct tape.) Routed the 3/8 inch tubing into the case via an open slottie. It was kinda butt ugly but it worked reasonably well.
When I switched to the Black Ice, I mounted that in the front of the case with the 120mm fan there sucking outside air in through the Blackice. This kept the entire cooling system inside the case with no hoses hanging out anywhere, looks better and seems to perform slightly better as well - maybe due to the fact that the Black-Ice is breathing in cool external air, while the Hayden was getting case-exhaust air which was slightly warmer?
The LiteOn FS020 case with three 120mm Panaflo fans has plenty of airflow either way, so I doubt the exhaust air is more than a couple degree's warmer than ambient intake air - at least I can't measure any real difference with a common glass thermometer, which is all I have other than the mobo socket sensor at present.