Walls, partitions and sections

Question

Once you have outlined a room in CADinput how do you turn one of the walls into a 'blank; so that ist represents an open space? 
 
 I followed the instructions on the help file but the section box is says opens up does not in my version of HEVACOMP.

Stephen Brown · Answer

Chris, to extend on Duncan's answer you should consider the following. Steady State calcs such as CIBSE will consider the temp on the other side of a partition. When using CAD Input this will default to the design condition specified for the adjacent room as it is assumed that condition will be met. If the design condition is the same for this sub room and the main office then there would be no net gain\loss across the partition anyway but the mass of the partition may have some effect on the overall result. As such I'd recommend creating a new 1mm thick partition type of lightweight material and set the partition to that type. If you're wanting to see something more dynamic due to differing design temps then Simulation would be needed as Duncan mentioned.