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HVAC & Ventilation
Static Regain Duct Sizer
Sizes a complete tree-shaped duct network by the static-regain method: the root trunk is set at a design velocity, then every downstream section is solved so the static regain from the velocity reduction pays for that section's friction, fitting and equipment losses. It identifies the governing worst-case path, hands back the fan duty, and draws the network as an interactive sketch.
Pinned to
ASHRAE Handbook Fundamentals 2021 SISMACNA HVAC Systems Duct Design 4th ed 2006ASHRAE Handbook Fundamentals 2009 SI (fitting-loss appendix)
Last reviewed against the printed text · 1 September 2026
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