Reply by MoshupTrail

You want the smoothest and largest interior possible. So rule out spiral or flexible ducting. Choose 5” diameter or 6” diameter if you can afford it. The other thing you want is “gentle” turns. There are two kinds of elbows available and you want the largest radius possible. PVC or metal heating duct will work fine, but you’ll need to seal every joint in the metal with metal tape. Do not use duct tape. Duct tape is about the worst choice possible for ducts ironically.
I would recommend a large trunk line (6”?) with smaller branches (4”?) to each tool.

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