Today's Electric Airduct Heater

Today's electric airduct heater is no longer just a hot resistance wire stretched across a metal frame in an airduct but a complete electrical system fully deserving the attention of electrical engineers. This paper presents information, such as the features, design, selection, application, control, codes governing the construction and installation, and other data, about electric airduct heaters in such a manner that a better understanding of their characteristics and use can be obtained.