2.6.3
Detector Spacing and Location
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NOTE: Do not show detector locations on plans,
however a detail for mounting smoke detectors to the
raised flooring system in compliance with this
paragraph should be shown.
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In accordance with the requirements of NFPA 72, the manufacturer's
recommendations and the requirements stated herein. Spacing and location
of detectors shall take into account the airflow into the room and supply
diffusers. Detectors shall not be placed closer than 1 1/2 meters 5 feet
from any discharge grille. Spacing of detectors on room ceilings shall not
exceed 41.80 square meter 450 square feet per detector. Spacing of
detectors under raised floors shall not exceed 23.25 square meter 250
square feet per detector. Detectors installed beneath raised floors shall
be mounted with the detector base within 50 mm 2 inches of the underside of
the raised floor framing, with the detector facing downward. Where the
space under the raised floor is less than 305 mm 12 inches in height,
detectors shall be mounted with their bases either horizontal or vertical,
with the detection chambers mounted in the upper half of the underfloor
space. Under no circumstances shall detectors be mounted facing upward.
[2.7
DUCT SMOKE DETECTORS
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NOTE: Automatic dampers are required in all ducts
passing through walls, floors, and ceilings, to
prevent the leakage of Halon from the protected
space, and to prevent the communication of fire and
smoke. Locations of dampers should be shown on HVAC
plans. Additional smoke dampers may be required in
systems over 424,740 L/m 15,000 cfm by NFPA 90A, Air
Conditioning and Ventilating Systems. Coordinate
with Section 15901, "Space Temperature Control
Systems." Provide access door in duct at each
system control panel only if no building fire alarm
system is provided. Otherwise delete paragraph
entitled "Duct Smoke Detectors."
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In accordance with the requirements of NFPA 90A, the manufacturer's
recommendations and the requirements stated herein. Detectors required in
ducts shall be ionization type and listed by UL Fire Prot Dir or FM P7825
for duct installation. Provide duct detectors with an approved duct
housing, mounted exterior to the duct, with perforated sampling tubes
extending across the width of the duct. Activation of duct detectors shall
cause shut down of the associated air-handling unit, annunciation at the
control panel, tripping of the [master box] [transmitter], and sounding of
building fire evacuation alarms. Detector shall have a test port or switch.
][2.8
INHIBIT SWITCH
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NOTE: Inhibit switches are optional devices which
decrease system reliability and shall not be used
without approval of the Division Fire Protection
SECTION 13966N
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