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NOTE: Regarding text below: Use this paragraph
if building has an existing fire evacuation alarm
system. For connection to existing system, designer
must determine if existing fire alarm control
panel is compatible with smoke detectors and has
spare zone capacity. Edit accordingly. When in
doubt leave choice of connection to fire alarm panel
or a separate control unit in paragraph. For some
antiquated alarm systems, it may be necessary to
replace the control panel in which case Section
13852, "Interior Fire Alarm System" must be included
in project and the first option should be used.
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[Provide in each air-handling system with supply air capacity greater than
944 L/s 2000 cfm in accordance with NFPA 90A. Locate downstream of the
supply air filters and prior to any branch connection in accordance with
NFPA 72. Provide in each air-handling system, serving more than one story,
and having a return air capacity greater than 7079 L/s 15000 cfm in
accordance with NFPA 90A. Locate at each story prior to connection to
common return and at return connection to air handler prior to any fresh
air inlet connection and prior to any recirculation connection in
accordance with NFPA 72. Design for detection of abnormal smoke densities
by the [ionization] [or] [photoelectric] principle, responsive to both
invisible and visible particles of combustion, and not susceptible to
undesired operation by changes to relative humidity. Provide UL listed or
FM approved detectors for duct installation. Provide duct detectors with an
approved duct housing, mounted exterior to the duct, and with perforated
sampling tubes extending across the width of the duct. Provide permanent
descriptive zone labels indicating in which air-handling units the
detectors in alarm are located.
Provide detectors with a test port [, test switch] [and] [or] [, remote
keyed test device]. Provide control and power modules required for
operation of detectors [in their own control unit] [or] [integral with the
main building fire alarm control panel]. A ground fault or single break or
open condition in electrical circuitry to any detector or its control or
power units shall cause activation of building fire alarm control panel
trouble signals. Electrical supervision of wiring used exclusively for
air-handling unit shutdown is not required provided a break in wiring would
cause shutdown of the associated unit. Equipment and devices shall be
compatible and operable in all respects with, and shall in no way impair
reliability or operational functions of, the existing building fire alarm
system. The existing fire alarm control panel was manufactured by [_____].
[Smoke control and exhaust systems shall have provisions for [automatic
and] manual operation by means of a key-operated switch to override any
other shutdown features and shall be located [adjacent to the fire alarm
system control panel] [as indicated].]]
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NOTE: Regarding the text below: Use this paragraph
only with specific approval of the Engineering Field
Division Fire Protection Engineer. Approval will
normally be granted only if the building has no fire
alarm system and none is required. When in doubt,
SECTION 15910N
Page 48
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