Quantcast Automatic Fire Alarm Systems

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(Refer to NAVFAC Guide Specification NFGS-16722 for further details)
GENERAL DESCRIPTION:  Automatic fire alarm systems are designed to
automatically detect and sound an alarm due to fire, heat or smoke and
consist of a system of detectors spaced according to definite criteria
limiting the area of coverage for each detector. Detectors are
available in a variety of temperature ratings to guard against false
alarms from premature operation in areas where normal ceiling
temperatures are unduly high in varying degrees.  Manual fire alarm
systems are extensions of and form an integral part of automatic fire
alarm systems.  Therefore, it is generally only necessary to insert a
paragraph in the manual fire alarm specification outlining the
requirement for automatic fire detectors.  where conditions permit, an
alarm is also automatically transmitted to fire alarm headquarters.
Automatic fire alarm systems utilize the following two general types of
Rate compensation heat detectors.
b.  Smoke detectors:  Actuation is caused by detection of abnomal
visible smoke densities using the photo-electric beam interruption or
light reflection and refraction principle, or ionization type.
CRITERIA:  Smoke detectors are generally installed in computer facilities,
child development centers, UOPHs, URPHS, dormitories, hospitals, elevator
lobby areas, in the machine room(s)- associated with elevator hoistvays,
and in air conditioning/air handling system at specific cfm levels. In
Air Force projects where automatic sprinkler protection is not provided
smoke detection and/or heat detection systems are required.
NOTE:  During design review stage(s), the PACVAVFACENGCOM Fire Protection
Engineer shall determine the type of installation and the extent of
automatic fire alarm system installations to insure that proper
equipment is being utilized and installation is proper for the
occupancies encountered.


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