Which of the following are considered final control devices for a heating system?

Final control devices in a heating system are components that directly regulate the flow of heat or conditioned air to achieve the desired temperature and ensure the system operates effectively.

The correct answer includes elements that serve as direct interfaces in managing airflow or heat transfer within a system. For instance, a conveyor, fluid coupling, slide-gate, and set of louvers all play significant roles in controlling the distribution of thermal energy or air within a heating system. The louvers can adjust the airflow in ventilation and heating applications, while a slide-gate can modulate the flow of materials or air. These devices consistently serve to refine control strategies and optimize performance based on the specifications of a heating system.

In contrast, the other choices list components that either do not act as final control devices or are part of different functions within a system. For example, control panels and thermostats typically serve as monitoring and signaling devices rather than directly controlling the output, while boilers and pumps act primarily to generate or move heat. Similarly, while items like furnaces and heat exchangers generate heat, they aren't final control devices; they serve a more primary role in heating before final airflow control is exercised. Other elements like chillers and air filters are associated with cooling or maintenance functionalities rather than direct