Header Sizing Calculator

Calculate manifold header diameter for multiple branch connections with balanced flow

Input Parameters

Results

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Header Diameter
in
--
Header Velocity
ft/s
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Area Ratio (H/B)
--
Min Port Spacing
in
Note: Area ratio > 1.0 ensures balanced flow distribution. Min port spacing of 3× branch diameter prevents interference.

Reference

A_header = Q / (v × 3.117) | d = √(4A/π) | Area Ratio = A_header / (n × A_branch)