What is the purpose of smoke dampers in relation to combustion air openings?

The purpose of smoke dampers in relation to combustion air openings is to prevent smoke migration. Smoke dampers are critical safety devices used in HVAC systems to mitigate the spread of smoke during a fire event. In the context of combustion air openings, they play a vital role in ensuring that smoke does not travel through supply or return air ducts and into other areas of a building.

When a fire occurs, smoke can spread rapidly, potentially leading to increased exposure to toxic gases and reduced visibility. By utilizing smoke dampers, which automatically close in the presence of smoke or as a result of fire alarm activations, the system effectively contains smoke within the affected area. This containment is crucial not only for protecting occupants but also for assisting emergency services in managing the situation. The design of smoke dampers ensures that they operate efficiently without compromising the HVAC system's performance under normal conditions, thereby maintaining safe air quality and operational integrity.