Neil,
Thanks for that.
Had a look and it is a simple design, but I don't like the idea of just using a window or door. I would really like it to be a sort of "clean room" so that I don't have to worry about dust, either during printing or drying - or am I being paraniod.
In a previous life
I was a an Industrial Chemist, and in our clean rooms we had the fans blowing in to the room (through HEPA filters but that is a bit extreme!). That way the room was pressurised compared to the outside air, so, in theory, you could only have leaks out of the room, not dust in. However these sorts of fans are expensive.
Like I said I also might be being paranoid about the amount of dust, but I hate re-printing due to a blob of dust on the Hahnemuhle!
Cheers
Steve