Which two types of automatic smoke and fire vents are commonly used today?

The selection of fusible link and drop panel as the common types of automatic smoke and fire vents is based on their design and function within building fire safety systems. Fusible links serve as a crucial component in activating vents; they are designed to melt at a certain temperature during a fire, allowing the vent to open automatically and facilitate smoke removal. This helps reduce smoke accumulation, which is critical for both life safety and property protection.

The drop panel operates as part of a system that permits smoke and heat to escape from a building. When activated, typically by heat or smoke detection, the drop panel descends to create an opening through which smoke can exit, further assisting in controlling smoke movement within the structure.

These two mechanisms work together effectively to manage smoke and fire spread, which is essential in maintaining a safe environment in case of a fire incident. Their integration into modern fire safety regulations further emphasizes their relevance and utility in current fire protection systems.

In contrast, while options involving gravity, smoke dampers, or other configurations may exist, they do not represent the commonly accepted types of automatic smoke and fire vents used to effectively manage smoke control in today's building designs.