When mechanical smoke extraction systems are
utilised within a building the effect of fi re growth is
notably less. The smoke laden air containing particles
of fuel and substantial quantities of heat is removed
from the atmosphere by the extraction system reducing
the speed at which a fi re grows, while assisting smoke
ventilation and allowing persons clear, smoke-free,
escape routes.
affect the fi re growth rate in so far as they provide a rich
source of fuel. It should also be noted that appropriate
levels of dust in the atmosphere may cause an explosion;
this subject is discussed later in this chapter.