Not sure of the name, but...

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Methodical, try Home Depot. I'm pretty sure I saw it there once or twice. Just make sure it can handle the exhaust heat...I think it's the same hose that people use for a dryer unit exhaust...
 
Definitely not dryer hose. I tried that and it just melted at the tips. It's available at auto supply depots but they're not cheap. I asked around a few shops to see if they were ready to toss some old ones but could find any at the time.
 
I've used those huge lengths of flexipipe you get at the autoparts store. They aren't exactly cheap, but it is legitimate exhaust pipe.

Kurt