Radiance XE/XS ventilation?

I have a TiVo Premier sitting on top of my Lumagen XS and an Oppo Blu-Ray underneath, and it does get fairly warm. For safety I got a 120mm fan kit from coolerguys.com with a thermal sensor that I placed at the back right corner of the Lumagen (where it seems to get hottest). I have 2 120mm fans that blow directly on to the back of all 3 devices when the thermal sensor detects the heat building (which is typically whenever they're on). Ever since doing that the temperatures of the devices have remained quite cool under all operating conditions.

If you're going to put something else directly on top of the Lumagen I'd recommend something active like that, but it's probably not required. Without the fan I wouldn't say it gets hot by any means, but it does warm up a bit and for longevity's sake the cooler you can keep it the better.