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Posted by HeatPro on October 18, 2005 at 22:26:21:
In Reply to: Steam air vents for 2-pipe systems? posted by Tom Stanton on October 14, 2005 at 14:28:46:
As the radiators have steam vents, it is most likely a one-pipe system converted from something else. Find out before messing with it.
http://64.226.150.132/hydronic/steam/steam1.htm