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The default height settings can be found in your Data Managers > Defaults menu.
Plenum heights only need to be defined if the ceiling plenum is used as a return air plenum.
In most cases the Floor height and Room height should be equal (resulting in a plenum height of 0.0).
Note, any ceiling plenum or air gap will instead be taken into account in your calculations as part of the Internal floor / Internal ceilingconstruction (i.e. in Data Mangers>Materials).