Building design technical terms refer to non-combustible walls that prevent the spread of fire to adjacent areas and have a fire resistance rating of not less than 3 hours. They are used for dividing fire compartments or as critical separating elements to prevent the spread of fire between buildings, effectively containing the fire to a specific area during the early stages and extinguishing process. This helps to block the fire from spreading from one side of the fire-resistant wall to the other, playing a crucial role in reducing fire damage.

Firewalls, along with common brick walls and floors, are fixed fire separation components; operable and closable types include fire doors, fire windows, fire curtains, and fire water curtains, etc.