Relationship Between System Inspector and System Schedules

Did you know?  The Static Pressure reported in a Duct System Schedule reports the same value that the System Inspector reports as the Static Pressure at the duct section closest to the inlet to that system.  This value is the sum of all the losses along the critical path for that system, including losses in duct segments, fittings, air terminals, and other accessories.

The Pressure Loss value you see in the inspector is the sum of the losses only in that section (which generally includes ducts and fittings of the same flow and size).