a few more bits collected, so many the images posted twice.
the small fan is interesting... 4 wires, needs a capacitor apparently. I've got Bernie on the job so should be ok.
Still not started yet but the design is coming on nicely, decided to ditch the ducting, the large fan may be too big but wont know until its installed. I'm on the hunt for scaffolding poles and lots of 2mm thick flat plate