It has become clear that to achieve the speeds and level of detail that I desire a fan is required. I experimented with a duct that uses the extruder fans in a reversed mode and had issues that I now feel were a result of cheap fans. I think with better fans that duct would satisfy a lot of people requirements.
But I want to be able to do active cooling controlled for each print if desired. I found this fan mount and duct on Thingiverse and was intrigued. Unfortunately I was not able to get it printed before I gave up on the ducts that I mentioned above so I resorted to using Nicks Hub on 3D Hubs. I had it in two days though it did cost me a few quid.
Here is Nick's version mounted on my printer and the one that I was then able to print.
That duct is a work of art both in how it works and how it looks. It even printed nicely once I had a copy of it mounted.