My brother in law got them here and sent me them, i put a pair on the shed too!
I think there are dealers in europe for them and you will be able to walk in and buy on your travels, beuty of this type is they are surface mounting with nothing underneath and ultra lightweight.
ULTRA-FAB rv solar vent is the name of product.
http://www.adventurerv.net/ultra-fab-mi ... 22616.htmlFor the kitchen/cooker vent i used two small computer fans which i mounted on a piece of clear sheet that slots in the sliding window and fitted a small plug on a lead and a small socket and switch, i can just put it in the window frame and lock it in place with the slider ie. put it on or take it off in a moment, plug it in and switch on/off, i tend to leave it up and have it on when cooking/driving etc. only uses 0.4A, works great, i'll put a pic up later.