What is the primary purpose of barometric dampers?

The primary purpose of barometric dampers is to moderate excessive updrafts and divert downdrafts in a ventilation system. These dampers play a crucial role in balancing airflow within a chimney or flue, allowing for a safe and efficient operation of heating appliances. By managing the pressure differences that can occur due to temperature changes, they help prevent draft issues that can compromise the efficiency of combustion appliances. When the pressure in the flue becomes too high, the damper opens to vent the excess pressure, while it remains closed when the pressures are equalized, ensuring optimal airflow and combustion efficiency. This function is vital for maintaining safety and performance in heating systems.