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. A fire damper that can be automatically closed when the smoke temperature exceeds 280℃ should be installed at the inlet of the smoke exhaust fan, and it should be interlocked with the smoke exhaust fan. When the fire damper is closed, the fan stops operating. Whether it is a longitudinally arranged corridor smoke exhaust system or a mobile arranged room smoke exhaust system, a fire damper that can be automatically closed at 280℃ should be installed at the junction of the smoke exhaust branch pipe and the vertical air pipe.  
Fire dampers in smoke exhaust pipes are set to be normally open or normally closed, which depends on the type of smoke exhaust outlet. For the room smoke exhaust system, when the smoke exhaust pipe serving one fire compartment is connected with multiple smoke exhaust outlets in different smoke-proof zones, a normally open fire damper should be installed in the pipe of that fire compartment, and normally closed smoke exhaust outlets or fire dampers should be installed in the branch pipes of other smoke-proof zones.