][2.2.4.3
Ionization Detectors
Multiple chamber type which is responsive to both invisible and visible
particles of combustion. Detectors shall not be susceptible to operation
by changes in relative humidity.
][2.2.4.4
Photoelectric Detectors
Operate on the light scattering principle using a LED light source.
Detector shall respond to both flaming and smoldering fires.
]2.2.4.5
Detector Spacing and Location
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NOTE: When underfloor detectors are used, the
designer must show a mounting detail for underfloor
detectors which complies with this paragraph.
**************************************************************************
Detector spacing and location shall be in accordance with the
manufacturer's recommendations and the requirements of NFPA 72, except
provide at least two detectors in all rooms of 54 square meters 600 square
feet or larger in area. In no case shall spacing exceed 9 by 9 m 30 by 30
feet per detector, and 9 linear m 30 linear feet per detector along
corridors. Detectors shall not be placed closer than [0.9] [1.5] m [3] [5]
feet from any air discharge or return grille, nor closer than 300 mm 12
inches to any part of any lighting fixture. In areas without finished
ceilings, mount detectors at the underside of deck above unless otherwise
indicated. [Detectors installed beneath raised floors shall be mounted
with the base within 50 mm 2 inches of the underside of the raised floor,
with the detector facing downward. Where the space under the raised floor
is less than 300 mm 12 inches in height, detectors shall be mounted with
their bases either horizontal or vertical, with the detection chamber(s)
located in the upper half of the underfloor space. Under no circumstances
shall detectors be mounted facing upward. Detector spacing beneath raised
floors shall not exceed [4.5 by 4.5] [6 by 6] m [15 by 15] [20 by 20] feet
per detector.]
2.2.4.6
[Single] [Multiple]-Station Detectors
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NOTE: Use the following paragraph for bachelor
enlisted/officer quarters, hotels, and similar
occupancies as required by MIL-HDBK-1008. For
family housing projects at NORTHNAVFACENGCOM use
regional guide specification NFGS-N-13854,
"Household Fire Warning Equipment" to specify
residential fire warning systems in lieu of
NFGS-13852.
**************************************************************************
Provide a [single] [multiple]-station [photoelectric] [ionization] smoke
detector in each sleeping room [and living room and corridor within a suite
of sleeping rooms]. Each detector shall contain an 85 dBA minimum alarm
sounder, test button, and visible indicating lamp. Lamp shall indicate
when the detector is in normal standby mode and provide a different
indication when the detector is in alarm. [When more than one detector is
installed in a suite of rooms, all detectors within the suite shall be
interconnected in multiple-station configuration so that when any detector
SECTION 13852N
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