The fire source should consist of two central, 1.5 m high,
solid piled stacks of cardboard boxes packed with polystyrene unexpanded
plastic cups upside down with a 0.3 m flue space. Each stack should
be approximately 1.6 m long and 1.1 m to 1.2 m wide.
A suitable plastic commodity is the FMRC standard plastic
commodity. Similar commodities might be used if they are designed
in a similar way and are proven to have the same burning characteristics
and suppressability. In each test, new dry commodities should be used.
The fire source should be surrounded by six 1.5 m high solid
piled stacks of empty cardboard boxes forming a target array to determine
if the fire will jump the aisle. The boxes should be attached to each
other, for example by staples, to prevent them from falling over (figure
8).
Figure 8