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Duct System Curve
Calculated by scaling every section airflow together and resolving the critical path at each operating point. Use it to compare the duct system requirement with a fan curve.
Design & Quantity Assumptions
Costs use your own currency consistently. Surface quantities are based on duct perimeter × centreline length; allowances for fittings, supports, seams, access doors, and local fabrication rules remain project-specific.
Automatic Terminal Flows
Enter airflow only at terminal nodes. XDuct will roll those values through every upstream or downstream segment and verify continuity.
Duct Size Assistant
Uses the segment airflow, selected air properties, roughness, and straight-duct Darcy/Colebrook loss. The smallest standard candidate meeting both limits is shown for each shape.