Firewall (construction)
Overview
 
A firewall is a fireproof barrier used to prevent the spread of fire between or through buildings, structures, electrical substation transformers, or within an aircraft or vehicle.
  • Firewalls can be used to subdivide a building
    Building
    In architecture, construction, engineering, real estate development and technology the word building may refer to one of the following:...

     into separate fire areas and are located in accordance with the locally applicable building code
    Building code
    A building code, or building control, is a set of rules that specify the minimum acceptable level of safety for constructed objects such as buildings and nonbuilding structures. The main purpose of building codes are to protect public health, safety and general welfare as they relate to the...

    . Firewalls are a portion of a building's passive fire protection
    Passive fire protection
    Passive fire protection is an integral component of the three components of structural fire protection and fire safety in a building. PFP attempts to contain fires or slow the spread, through use of fire-resistant walls, floors, and doors...

     systems.

  • Firewalls can be used to separate high value transformers at an electrical substation
    Electrical substation
    A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions...

     in the event of a mineral oil tank rupture and ignition.
 
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