Pressure drop calculation / system inspector

[bcpratt]

I've been able to successfully generate a pressure drop report for a few systems in my project.  I have an exhaust system that appears to be well-connected, but after running the pressure drop calculator have found that a negative airflow(?) has crept into the system for some reason.  Why would this happen?  It is a fairly simple exhaust system with two grilles, ductwork, an exhaust fan and a louver.

Thanks.

[Chris.Aquino]

To give the community a better idea of what you are seeing, please post a stripped down sample file showing this behavior.

[billy.barrios]

Perhaps you might have to check you're equipment connections and make sure they're set to bi-directional. That might fix it.

[scott_dakin1]

One of the connectors will be working in the wrong direction.