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partitive
walls, windows and doors
They
prevent spreading of fire
from
the originating area.
They
are marked with letters marking its
features,
and numbers which represent
the
minutes from the begining of the
hazardous
exposure till the loss of these
particular
features:
-
unity E
-
insulation I
-
warmth radiation W
-
automatic closure C
-
constrained gas emission S
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