Some people call baseboard heaters radiators, so we need to be sure it does not refer to them, but to standing radiators of the larger, taller type. If your standing radiators have no vent plugs; you will have to find them or install them. A standing high radiator is a natural air trap; they also have vent locations nar the top.
Also read:
http://64.226.150.132/hydronic/service/purgeair.htm
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