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robert2JCCH
in reply to: bims2

My apologies for any language barriers.

 

It sounds like you are attempting to assign a ventilation air per person requirement to an area in the project. 

 

Rooms (found in Architecture tab) do not typically carry this information - Rooms are mainly used for architecture-related parameters

 

Spaces (found in Analyze tab) can carry this information. The Space Type parameter brings up Space Type settings, which can be defined with a number of values, including ventilation air:

 

robert2JCCH_1-1701982896024.png

 

robert2JCCH_0-1701982482518.png

 

Unfortunately, this would mean having to transfer your UNI sheet values into this Space Type Settings format. This can be done manually, with some third-party addins, and with Dynamo. Once done, you would have this for any future projects as well.

 

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If you still want to use calculated parameters, you should know that you cannot check string text in Revit parameter formulas. So     [if(Parameter="VALUE",A,B)]        is not valid.