Access the venting analysis parameters on the Venting Analysis tab of the solver parameters dialog. The Venting analysis locations grouping option is Off by default. Change the setting to either On (Use vent property ID only) (recommended) or On (Use vent property ID and node connectivity).
If the vent is wide enough so that there are several nodes within the specified vent size, then all nodes within the vent width must be set as venting analysis locations, and these venting analysis locations must be grouped as one vent.
Example: If the vent width is 2 mm, and the distance between nodes A and B is 1.8 mm, then all nodes between A and B, inclusive, must be set as venting analysis locations with the same vent property ID and grouped as one vent.