Check this out: NACA_Profile_Calculator.xls
This should allow you to measure how much space you have available, then calculate the the maximum size duct that will fit in that area while still maintaining the correct proportions.
And yes, SM is fucking awesome! I just hope that in some...
I know you said this is not a possibility, but I really recommend buying a hoist. You can get them new from $150, and I'm sure you can find them cheaper if you buy used. You'll surely find another use for it in the future, and it will make the job a lot easier.
From someone who needs all the help he can get, thanks! This community survives because people like you are willing to help out people like me! We appreciate it!
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