In all the calculations, the total length of duct has to be figured in the calculations....
If you have 10 feet of exhaust, and 22 feet of fresh make up air, you have to do all calculations as 32 feet of duct work....
When you squeeze duct size down (reduce square inches of duct) you are increasing static pressure... Not shape here so much but shape does matter because every time air changes direction (even inside duct) it causes turbulence and turbulence is cause if increased static pressure...
This is why its prudent to use as large a duct as practical, minimum number of bends and avoid flex duct when ever possible...
Having intake air separated from exhaust by the 10ft (minimum) distance should keep you safe, its the "standard" for most air exchange processes..
Dale
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