What's the formula for finding the throat radius of a standard 90-degree elbow?

For a standard full-radius commercial elbow, the standard throat radius typically matches half the width of the turning duct dimension (R = \frac{W}{2}), unless high-velocity performance parameters require a full 1.5 \times D radius turn.

['For a standard full-radius commercial elbow, the standard throat radius typically matches half the width of the turning duct dimension (R = \\frac{W}{2}), unless high-velocity performance parameters require a full 1.5 \\times D radius turn.']

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• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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• For a standard full-radius commercial elbow, the standard throat radius typically matches half the width of the turning duct dimension (R = \frac{W}{2}), unless high-velocity...

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