Which fan is responsible for helping the products of combustion move up the stack?

The induced draft fan plays a critical role in assisting the movement of combustion gases or products up the stack. Its primary function is to create a negative pressure within the combustion chamber, which helps pull the flue gases through the system and expel them into the atmosphere. This process is essential for maintaining proper airflow and ensuring that combustion is efficient, thus promoting safety by preventing the buildup of harmful gases inside the system.

In contrast, forced draft fans are typically involved in delivering air into the combustion chamber to support the burning process, while centrifugal fans and blower fans serve various other applications that may not specifically focus on the removal of combustion byproducts. By focusing on the induced draft fan, one recognizes its essential function in the safe and effective operation of combustion systems.