Port too long for box

[KilluminatiDre 10+ year member]

I have a question about a slot port with a 90 degree bend. Say for example the port length is too long for the size of the box using one 90 degree bend. I've seen boxes with multiple bends that look like a maze, is there a certain way to calculate these bends? Or maybe a program that does it?

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[n8skow 10+ year member]

Picture a line down the center cross-section of your port - use that for your measurement.