XDuct by CalculationX
Duct pressure drop calculator for HVAC duct networks
Model supply, return, and exhaust duct systems with rectangular or circular sections, fitting losses, ASHRAE coefficient inputs, and critical path results.
What XDuct calculates
XDuct helps HVAC engineers build duct networks, review pressure losses, and identify the governing duct route for fan pressure and balancing decisions.
Duct section losses
Calculate friction, velocity pressure, and section-by-section pressure drop for rectangular and circular ductwork.
Fitting schedules
Use fitting forms and coefficient data to document elbows, transitions, junctions, entries, exits, and takeoffs.
Critical path review
Rank paths and highlight the route that controls fan pressure or system balancing.
Project documentation
Save editable projects, export files, and create PDF reports for engineering review.