Which construction requirement is necessary for fan buildings related to fire safety?

Fan buildings play a critical role in maintaining air quality and circulation in underground mines, and when considering fire safety, the materials and construction practices used in these buildings are crucial. One of the key requirements for fan buildings is the use of fireproof air ducts. This is because, in the event of a fire, the ducts need to be able to withstand high temperatures without igniting or allowing flames to spread through the ventilation system. Fireproof materials help ensure that the airflow remains controlled and that toxic smoke or gases do not enter areas where personnel might be located.

Using fireproof air ducts contributes significantly to overall fire safety regulations stipulated for underground mining operations, as these ducts are integral to preventing the propagation of fire and safeguarding miners' health and lives. Thus, this requirement is essential for the overall fire prevention strategy within underground mining environments.