10 feet. Horns used in exterior locations shall be specifically listed or
approved for outdoor use and be provided with metal housing and protective
grilles.
2.6.3
Chimes
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NOTE: Chimes are normally only used in hospitals to
alert the staff about a fire emergency without
arousing the patients. Sound output is low and
prevents them from being used in areas having even
moderately low noise levels.
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Chimes shall be electrically operated, supervised, electronic type, with an
adjustable frequency of 800 to 1200 Hertz. Chimes shall have a minimum
sound rating of [80] [_____] dBA at 3.05 m 10 feet. [Chimes shall ring the
bell codes, as indicated.]
2.6.4
Visual Notification Appliances
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NOTE: ADA requires that Visual Notification
Appliances be provided in buildings and facilities
in each of the following areas: restrooms, and any
general usage area (e.g., meeting rooms), hallways,
lobbies, and any other area for common use. The
Visual Notification Appliance shall be mounted at 2
m (80 inches) AFF or 150 mm (6 inches) below the
ceiling, whichever is lower. In general, ADA
requires no place in any space or room to be greater
than 15 m (50 feet) horizontally from a Visual
Notification Appliance. In large rooms and open
spaces, without obstructions over 1.8 m (6 feet)
AFF, the designer should not suspend Visual
Notification Appliances from the ceiling.
Drawings will indicate location, dimensions,
content, details, and other required information to
indicate extent of complying with ADA requirements.
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Visual notification appliances shall conform to the applicable requirements
of UL 1971 and the contract drawings. Appliances shall have clear high
intensity optic lens, xenon flash tubes, and output white light. Strobe
flash rate shall be between 1 to 3 flashes per second and a minimum of 75
candela. Strobe shall be [surface] [semi-flush] mounted.
2.6.5
Combination Audible/Visual Notification Appliances
Combination audible/visual notification appliances shall provide the same
requirements as individual units except they shall mount as a unit in
standard backboxes. Units shall be factory assembled. Any other audible
notification appliance employed in the fire alarm systems shall be approved
by the Contracting Officer.
2.6.6
Voice Evacuation System
The voice evacuation system shall provide for [one-way] [two-way] voice
SECTION 13851A
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