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radiator vent sizing

Just got my first job helping a guy get a steam system (1 pipe) at one of his rentals (2 fm) in order. From talking to him on the phone I was able to diagnose most of his problems and tell him what needed to be done before I even saw it. Something several plumbers were clueless to fix.

Thanks to the expertise of this site BTW.

My Q is sizing the new vents for certain rads all of which are on the second and third floor. In some cases a 2nd floor rad is fed from a pipe that keeps going up to a third floor rad directly above. Would you use a vent the next size up for the 3rd floor?

I will post pics of the project in a few days.


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