An enclosed zone differs from an area or floor load type in both how the area is defined as well as how the load distribution is calculated.

• define openings within the loaded boundary
• select members to ignore when forming the loading panel
• select members to ignore for load transfer

Limitations

• No more than 500 enclosed zones can be included in a model.
• No more than 400 boundary nodes can be used in a single enclosed zone.
• No more than 400 openings can be included in a single enclosed zone.
  Note: This limit is dynamic such that the actual maximum is capped at 80% of the total nodes in the model file. If this threshold is met, then it is suggested to redefine the zone boundary for a balance between memory and performance.
• Enclosed zone loads are not considered for generated mass models, regardless of the load type.
• Live load reduction is not applied to enclosed zone loads.