What should a duct heating system generally include?

A duct heating system should generally include an interlock system to ensure proper operation and efficiency. The interlock system is designed to coordinate the operation of the heating elements with other system components, such as the air handling unit or blower. When activated, this system prevents the heating elements from operating unless there is adequate airflow, which helps to avoid overheating the ductwork and ensures that heated air is delivered efficiently throughout the space.

While additional heating elements, zone dampers, and thermostatic controls are useful components in various HVAC systems, they are not universally essential for every duct heating system. The primary function of the interlock system is to provide safety and enhance performance by ensuring that all parts of the system work in harmony. Thus, its inclusion is vital for maintaining system integrity and energy efficiency.