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End of main vent of some sort part #20-1885

dead Member Posts: 1
Harvard Medical School old steam system partialy converted to hot water has 3 air vents?part #20-1885 pat.june 1863(thats all info I could get off them)looks to be installed upside down and piped together they have 3/4 pipe running to each one seperatly installed in top of building 20 feet above all is hot the other two are cold.Before I tear the walls apart and trace back piping I would like to know exactly what they are.I need more info on system and am working on that.  


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