SC Air Conditioning Practice Questions - South Carolina Air Conditioning Contractor Examination Exam

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Electric duct heaters installed in an air-handling system must be listed for the application and, among other IMC/listing rules, typically require:

That duct liner continue through the heater without interruption That they be used only in Type I grease ducts Installation immediately downstream of a combustible flexible connector with no airflow proving A fan-interlock or airflow-proving device so the heater cannot energize without airflow

Correct Answer:

A fan-interlock or airflow-proving device so the heater cannot energize without airflow

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