Prevent the fire from spreading to the floor where the fan room is located.  
A flame arrester is a safety device used to prevent the spread of flames from flammable gases and flammable gas vapors. It is installed in pipelines that transport flammable gases or on ventilated tanks to block the passage of transmitted flames (deflagration or detonation). The wiring of the smoke exhaust valve consists of an aluminum silicate insulation cotton core, a flame arrester shell, and accessories.  
Flame arresters are also widely used in pipelines that transport flammable gases. If the flammable gas is ignited, the air flame will spread to the entire pipeline network (triggered by the smoke exhaust valve interlocking to stop the fan). To better prevent such risks, flame arresters must be used. Flame arresters can also be applied in pipelines of equipment with open flames to prevent thermal processing accidents. However, they cannot prevent the open-flame combustion of flammable gases and liquids in open combustion scenarios.  
The above is a brief introduction provided by us regarding fire-fighting smoke and fire dampers. For any necessary inquiries or corrections, you may visit our official website for detailed consultation.