What is the function of a stack in a boiler system?

The function of a stack in a boiler system is primarily to vent combustion gases safely outside. As the boiler operates, it burns fuel to produce heat, and this process generates various combustion gases, including carbon dioxide and water vapor. The stack serves as an exhaust outlet that allows these gases to escape the boiler room and enter the atmosphere, thereby preventing the buildup of harmful gases within the living or working space.

A well-designed stack also helps maintain the efficiency of the boiler by promoting better airflow through the system, which is essential for proper combustion and heat exchange. By managing the exit of combustion products, the stack ensures compliance with environmental regulations and contributes to overall safety by reducing the risk of flue gas leaks into occupied spaces. This function is critical for both operational efficiency and health and safety standards in boiler operations.