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Posted by HeatPro on September 18, 2004 at 19:58:23:
In Reply to: Steam Radiators posted by Wolf on September 18, 2004 at 18:44:32:
They are air vents that meter the speed at which air leaves so the radiator output can be balanced for each room. The steam pressure will be around 2 psig and the steam relief valve on the boiler is set at 15 pounds; but don't change the pressure settings from about 2 psig or you will make problems.
A full explanation is at:
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