So, I decided to build another paint booth; the one I used back in the 90's was broken up and the fan chucked out.
Looking around my shed, I found a 12" Davies Craig fan (automotive engine cooling fan) as well as a rectangular flood light (the type that has a globe about 4" long).
So, I grabbed some spare MDF from the back of the shed and knocked-up a 4-sided box, added a couple of timber battens and mounted the fan on the back. Cut a rectangular hole in the "roof" for the floodlight (which will act as the source of both light and heat).
I've used small Anderson plugs (known as "power poles") to connect the fan to a pair of N70ZZ batteries (these are the same batteries I use to power several of my Peco point motors). I used a turn-key switch for the fan motor. It works well..... TOO well in fact! The fan has so much suction that the first test I did was by putting a 40' plastic container on the turntable, on top of a plastic lid off a paint spray can. The fan almost sucked the container into it's path.
Hmm, time to re-think. I tried to use a domestic dimmer switch I had lying around, to control the speed. Part of me knew that wouldn't work....only designed for AC power. A quick check on google and ebay and I've come up with a $20 solution which I hope will work: http://www.ebay.com.au/itm/170916129430?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Anyway, we'll see what happens and I'll post some pics if anybody's interested.