What device is designed to close automatically upon detection of heat and resist the passage of flame and smoke?

The device designed to close automatically upon detection of heat and resist the passage of flame and smoke is a combination fire/smoke damper. This type of damper plays a crucial role in fire protection systems by sealing off areas and slowing down the spread of fire and smoke in ductwork and building spaces.

When the heat from a fire triggers the detection system, the combination fire/smoke damper activates, closing its blades to prevent the flames and smoke from traveling to other parts of the structure. This not only helps contain the fire but also plays a vital part in maintaining the integrity of fire-resistance-rated walls and ceilings.

In contrast, other devices like smoke detectors primarily sense smoke and trigger alarms but do not physically close or seal off areas. Fire alarms alert occupants to evacuate but also do not block fire or smoke. A fire shutter may offer similar functionality in terms of sealing off spaces but is specifically designed for openings, while a combination fire/smoke damper encompasses a broader application, working within duct systems and various building configurations to effectively control fire and smoke movement.