# Exporting the Exterior Envelope

Sometimes all you need is the building envelope. You can use the [Merge Rooms](/user-manual/model-editor/commands/alphabetically/me_merge_rooms.md) command with a high tolerance value to merge the rooms on the floor together quickly. This is also a necessary step for creating [core and perimeter models](/user-manual/model-editor/workflows/creating-core-and-perimeter-models.md).


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