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Posted by Harold hydronicnetwork.net on December 27, 2003 at 08:42:27:
In Reply to: How Do You Size Main Line Steam Air Vents? posted by Jake on December 26, 2003 at 23:39:47:
Main steam vents are larger than needed to serve most residential steam systems. If not, a manifold from a tee on that riser can hold another. As most systems were installed over 50 years ago, it is usually a matter of selecting the 1/2 or 3/4-tapping version to fit the existing riser.