provided in the building and surrounding area. Surface mounted audible
appliances shall be painted [red] [white] [_____]. Recessed audible
appliances shall be installed with a grill that is painted [red] [white]
[_____] [with a factory finish to match the surface to which it is mounted].
2.6.1
Alarm Bells
Bells shall be surface mounted with the matching mounting back box [surface
mounted] [recessed]. Bells shall be suitable for use in an electrically
supervised circuit. Bells shall be the underdome type producing a minimum
output rating of [85] [_____] dBA at 3.05 m 10 feet. Bells used in
exterior locations shall be specifically listed or approved for outdoor use
and be provided with metal housing and protective grilles. Single stroke,
electrically operated, supervised, solenoid bells shall be used for coded
applications.
2.6.2
Alarm Horns
Horns shall be surface mounted, with the matching mounting back box
[surface mounted] [recessed] [[single] [double] projector,] [grille and]
vibrating type suitable for use in an electrically supervised circuit.
Horns shall produce a sound rating of at least [85] [_____] dBA at 3.05 m
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.
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.
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SECTION 13850A
Page 23
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