In underground garages equipped with mechanical smoke exhaust systems, fire and smoke exhaust fire dampers are mainly adopted in the following parts in accordance with the requirements of the specifications:
1. Passing through the fire compartment of the firewall;
2. Passing through the ventilation and air conditioning machine rooms;
3. The junctions of the horizontal main pipes and the vertical main pipes on each floor;
4. Pass through both sides of the deformation joint.

The smoke exhaust fire damper is analyzed in combination with the specific ventilation system: For the supply fan in the underground garage, an electric air volume regulating valve or a fire regulating valve (which automatically closes at 70°C) should be installed at the outlet supply air main pipe where it passes through the fireproof wall of the machine room. When the supply air system needs to be shared with the fire mechanical supply air system, an electric air volume regulating valve that automatically closes at 280°C should be adopted. Specific analysis should be conducted on the air intake. For supply fans that directly draw in air from the outside (i.e., garages with only one underground floor), fire dampers do not need to be installed at the air intake. When there are multiple supply fans in the fan room, check valves should be set at the air intake of each fan. When multi-story underground garages adopt centralized air intake through air shafts, a fire damper or fire regulating valve (which automatically closes at 70°C) should be installed at the suction inlet of each supply fan.

Supply and exhaust air ducts should not pass through fire compartments such as firewalls and non-combustible floor slabs. If they do pass through, a 70°C fusible smoke and fire damper should be installed at the passing point... When fire smoke passes through the fire compartment, the fire damper can close immediately. This electric air volume regulating valve generally uses smoke detectors rather than fusible metals or fusible components for control, which can prevent the spread and expansion of fire in a timely and smooth manner.