Firewall (automobile)
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Cutaway drawing of the 1934 Citroen, showing the firewall
In automotive engineering, a firewall is the part of the bodywork that separates the engine from the driver and passengers.
It is most commonly a separate component of the body, or in monocoque construction, a separate steel pressing, but may be continuous with the floorpan or its edges may form part of the door pillars.
The name originates from steam-powered vehicles. The firewall would separate the driver from the fire heating the boiler.
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