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updated steam systems in commercial buildings.
hi. i am a residential oil burner mechanic,going for an interview for a position,of maintenance mechanic ,were i noticed the few buildings have steam boilers,and in every room the old castiron radiators have been removed ,and replaced by some type of square looking baseboard and have some blowers in it.also every room have thermostats.the buildings that i am talking about are schools.so there is no central ac.if any one can help me with the order of this type of operation.the buildings are 70 years old.i do not know if is a single pipe or two pipe system.