<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body bgcolor="#ffffff" text="#000000"> <o:p></o:p>Hi, We have modelled a room as one simple zone and would like to include obstacles like furniture or additional thermal mass within the zone. Following the FAQ list about how to create furniture, we have conducted the following steps: (a) Creation of two surfaces back-to-back inside the zone (not attached to other bounding surfaces) (b) assignment of a material from the material database to each of the surfaces whereby the material contains only half of the total thickness, (c) boundary assignment using ‘adiabatic’ conditions.<o:p></o:p> Conducting a ‘check surface-vertex topology’ after step (a), an error is displayed which states that the ‘enclosure is improperly bounded’ and that ‘edges between vertices… may be unbounded’. What is the exact procedure to solve this problem? Is it for example necessary to link the furniture surfaces to the enclosing surfaces somehow? Any advice is appreciated.<o:p></o:p> Regards<o:p></o:p> Tobias<o:p></o:p> </body> </html>