Square metal ducting?

[Northy]

Does anyone know anything about or could even supply some square metal ducting? The sort that you see people crawling through on films and hanging from supermarket roofs!

I need to make something for a show to attach one of our products to, and as it's an industrial type product I thought some of this stood upright, free-standing, about 6 foot tall would be quite cool?

I have found a place to get it online, but have no idea about all the different ways of connecting it together. It would need to be broken down to transport there ideally.

Anyone? Feel free to pm me.

Thanks,

G