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sizing my main line vent

al leone
al leone Member Posts: 25
Can anyone tell me the size and type vent i should have on my system?
Off my steam boiler comes a 3" header it runs about ten feet with 1-1/4" tees and risers to a third floor unit
there are 6 radiators on the floor, all 1-1/4 piped
the 3" main is dripped at the end and the vent is on the end of the return just befor it drops down the the return into the boiler.


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