My rack sits happily on top of the Roadster, but there's only about a 3/4" gap between the venting on the top of the head and the bottom of the rack case. And that's probably not good.
What are my fan options, other than macgyvering something up on my own? When I'm playing with my drummer, the rack will obviously not be blocking the venting, but it still concerns me for extended jams at home.
I'm not sure a standalone product exists to cool amp heads. I know that the Mark IV has a fan in it, but beyond that I'm drawing a blank.
Green James posted this pretty nice homegrown rack cooling system on SS a few years ago, but that won't really serve your needs very well: How to build a cooling system for your rack. - Sevenstring.org