240
The Fire Section: Fire Section Characteristics
242
FIRE SECTION CHARACTERISTICS
242.1
SIZE
242.1.1
Use of a fire section approaching the maximum code size of 20,000
square feet will minimize the necessity of expensive fire-rated elements.
The optimum service module size (exclusive of the service bay) is about
10,000 square feet. When the sum of the area of two adjacent service
modules is less than 20,000, two modules per fire section should be used.
When the sum of adjacent service modules exceeds 20,000 square feet,
each module will coincide with a fire section.
242.1.2
It must be noted that fire safety codes and regulations which govern fire
section size and existing requirements are subject to constant review and
change. For example, much attention is currently focused on the use of
automatic sprinklers throughout the hospital. If this concept is
implemented, it is reasonable to anticipate that certain relaxations with
regard to the size of the fire section and criteria for exit distances may
follow.
242.2
SHAPE
Service modules are most efficient when their boundaries are regular and
form a simple shape. The fire section boundaries, which are coincidental
with those of the service module, should also be simple in shape.
242.3
RELATION TO FUNCTIONAL ZONE
242.3.1
In a traditional planning sequence, fire separations are determined after
all rooms have been configured. Separation walls follow an irregular path
along the boundaries of rooms. In applying the system, fire section
boundaries are to be determined prior to detailed planning, and establish
a regular framework of permanent components within which departmental
areas must be planned (See Figure 240-2). The fire sections must be
carefully configured and coordinated with internal corridor arrangements
to ensure that required exit distances can be maintained.
242.3.2
A rectilinear system of fire separations imposes minor constraints on
planning while offering significant advantages in the organization of
service zones. Fire separation walls in the functional zone can be
penetrated by fire-rated doors at any point either in initial construction or
in subsequent alterations.
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