How do I design an elbow with Duct Work for a 90 Degree bend?

I need to design a 45 degree elbow and a 90 degree elbow. In the 45 degree elbow, I am using 6 inch round steel, with 2 angles (3 pieces) (twice the radius). In the 90 elbow, I am using 20 inch round steel, three times the radius, and 4 angles (5 pieces).
What are the degrees and lengths? How did you find it?

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  1. tlbs101, 05 June, 2010

    I would just go to Home Depot or Lowes and buy one of each (45 and 90) and take measurements. They sell variable angle joints, so you can set the radii and the angle. That way you can visualize all that you need to visualize.

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