← All tools
DUCTIQ
FREE TOOL · TRADIEROLES.COM
Total system pressure0Pa
+ Margin0 Pa
Sections0
Peak velocity0.0 m/s

Project

Duct run · index path

worst-case path, fan to terminal

System summary

Friction: Darcy–Weisbach, Colebrook friction factor. Rectangular via Huebscher equivalent diameter, flat oval via Heyt–Diaz. Fitting losses C₀×Pᵛ on actual velocity. C₀ values are typical defaults — edit per fitting against DA3/ASHRAE tables for certified work.