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Why do I see "N/A" for all fire flow results for all nodes in the Fire Flow Node Table?
You may not have the calculation option set to perform the automated fire flow calculations. Go to Home > Options or Analysis > Options to open the calculation options (in V8i, go to Analysis > Calculation Options). Double-click the active calculation option (designated by the red check mark) to open the calculation options in Properties. Find the property "Calculation Type" and set this to "Fire Flow".
If the Calculation Type is set to Fire Flow, ensure that you are not encountering any red user notifications, which indicate a critical problem that prevents the model from being calculated. Results of "N/A" entries can also be caused by omission of the node from the fire flow selection set. In the Fire Flow alternative, make sure that all the nodes you would like to study are included in the selection set selected for "Fire Flow Nodes" pulldown menu. The fire flow run will only analyze and provide results for nodes in this selection set.
Understanding Automated Fire Flow Results