Fire-fighting smoke and fire dampers are fire-fighting components. Some mechanical equipment is installed in the pipelines of the mechanical smoke exhaust system. Now, I will explain the main functions of fire dampers to help you understand them. Fire dampers are set to be normally open or normally closed, and the setting of galvanized sheet fire dampers depends on the type of smoke exhaust outlet. When a normally closed smoke exhaust outlet is installed, a normally open fire damper should be installed in the smoke exhaust branch pipe. When some normally open air vents are installed, a normally closed fire damper should be installed in the smoke exhaust branch pipe. When a normally closed fire-fighting smoke exhaust outlet is installed, no fire damper is required on the smoke exhaust branch pipe.  Basements equipped with mechanical smoke exhaust should be provided with exhaust equipment. If a mechanical exhaust system is used, a fire damper with a 70℃ fusible link should be installed on the fan inlet pipeline.  For the mechanical forced ventilation system, a gravity-type fire damper can be equipped with a fire-fighting smoke and fire damper with a 70℃ fusible link on the inlet pipeline of the forced smoke exhaust fan to prevent the fresh air system inlet from being damaged by fire and smoke and to prevent smoke from being transported into the room.