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Installing the duct a piece of cake the ceiling joists run the right way so I dont have to worry about running into one going through the ceiling.
I need to go between the ceiling joists 90 through a wall and 90 back up and straight up and out. Maybe 6 feet of 6 inch duct at the most.
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Excuse me? 6" duct for 1200 cfm? I don't think so. You're not installing a high pressure system. Isn't the spec 12" square? (or was that the last one I looked at?)
In my case (8" round) the installer said, "You're going to run right into a joist, so I want to split the duct around the joist." I nearly fired him on the spot. "No. This section of duct is behind the fire trap. You cut the joist, sister it, and run intact to the roof." I could see he wasn't happy, but there is a right way and a wrong way to do things.