The user connects the nodes with polylines which represent the actual branch airway path. The branch must have a start node and end node but you can have dummy nodes in between so that the actual branch path is used and the branch length can be calculated for use in the resistance formulas.
The system has many features to simplify editing schematics and enhancing the ventilation diagram. All changes to a schematic drawing are stored permanently. Output consists of colour-coded schematics diagrams with branch quantities and node pressures.
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