Firewalls Outside of Building Construction
Firewalls are also regularly found in aircraft and in specially prepared cars for compartmentalisation and competition use. For example, a typical conversion of a production car for rallying will include a metal firewall which seals the fuel tank off from the interior of the vehicle. In the event of an accident, resulting in fuel spillage, the firewall can prevent burning fuel from entering the passenger compartment, where it could cause serious injury or death. In regular stock cars, the firewall separates the engine compartment from the cabin and can, at times, contain fibreglass insulation. Automotive firewalls have to be fitted so that they form a complete seal. Usually this is done by bonding the sheet metal to the bodywork using fibreglass resin.
The term firewall is also commonly used by automotive mechanics to refer to the barrier between the passenger and engine compartments of a vehicle. The inner and outer surfaces of the firewall are often coated with NVH-absorber to prevent most engine noise from reaching the passenger compartment.
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