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Three objectives of passive fire protection
- To prevent or limit the further spread of fire, smoke and heat
- To retain the stability of the building and the structure for as long as possible
- To guarantee safe escape routes for those inside the burning building
Four passive fire protection criteria
A building element exposed to fire and a mechanical load must sustain its support function. The structure should not collapse or bend out of shape too much because of the heat.
When exposed to fire, a separating construction element must not show any holes or cracks allowing flames or hot gases to escape. The thermal radiation also has to meet certain requirements.
This criterion determines a construction element’s ability to keep the rising temperature on the other side of the heat source within the prescribed limits to minimise the risk of ignition.
A fire resistant separator has to contain smoke as well as fire. Smoke resistance is determined in a smoke leakage test at room temperature and at an elevated combustion gas temperature.