Place Individual MEP Elements

You can build up the desired mechanical system by placing individual elements one by one:

Select the desired tool and place the first element.

Select the tool of the next element to be placed. Ensure that the right placement hotspot is set (the placement hotspot is the square one, in the 2D Symbol preview in the Preview and Positioning Panel).

https://helpcenter.graphisoft.com/wp-content/uploads/mep_modeler_user_guide_for_archicad_ 23/mep_user_guide/PlacementSpot.png 

On the Floor Plan, click at any available connection point (indicated by a checkmark cursor) on the existing element.

The elements will connect correctly. The second element - while using the default settings of the active tool - will nevertheless adopt the connection geometry of the first (already placed) element. Connection geometry includes (as applicable): shape, height/width, thickness of element wall, connection type (e.g. flanged or not): these are the same parameters you set in the Connections tab page of the element’s MEP Custom Settings tab page.