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Posted by HeatPro on December 15, 2004 at 19:19:04:
In Reply to: Radiator air valves posted by John on December 15, 2004 at 17:51:53:
You size them mostly by observation:
http://www.gogeisel.com/geiselonline/support/Hoffman/Steam_Vents/Model_1A_1B_Installation.pdf
http://www.gogeisel.com/geiselonline/support/Hoffman_Steam_Vent_Information.html