There is a more elegant way to do this using Graphic Overrides.
First make sure your interior elevation settings has the "Transparent" checkbox checked.
Then build a Graphic Override that has all settings turned off and the "Surface" checkbox checked. Then set the Surface to "Air"
You can use all the filters to include/exclude items affected as usual.
In the example below the millwork has been excluded and is not transparent, while the equipment has turned transparent to see the outlets behind the equipment.
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