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Steam riser with no air vent or radiators?

bipbap Member Posts: 191
We have a steam riser that used to serve bathrooms with radiators.
The radiators were disconnected long ago leaving just the riser with a air vent at top.

Just curious, what would happen if there was no air vent on a 3-story steam riser with no radiators attached either? Would it not get hot at all?