What is a damper used for in ventilation systems?

A damper in ventilation systems serves a crucial role in controlling the draft or flow of gases. Specifically, dampers are mechanical devices that adjust the airflow within ductwork and ventilation systems. They can be opened or closed to regulate the volume of air passing through the duct, which is essential for maintaining proper air balance and ensuring efficient system operation.

In the context of the NFPA 96 Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, managing the draft is vital, especially in commercial kitchens where smoke and heat must be effectively exhausted. The proper functioning of dampers can aid in ensuring that the exhaust system is not adversely affected by negative pressures or uncontrolled airflows, which could lead to dangerous conditions.

In addition to controlling airflow, while dampers may contribute indirectly to other aspects like noise reduction or preventing backflow, their primary purpose aligns with the management of gas flow and draft within the ventilatory framework. This makes the selection of the correct answer critical for understanding the functional importance of dampers in ventilation systems.