Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 9 - Fire Protection Systems
Section 907 - FIRE ALARM AND DETECTION SYSTEMS
Subsection 907.2 - Where required-new buildings and structures
Universal Citation: 780 CMR MA Code of Regs 907.2
Current through Register 1531, September 27, 2024
An approved fire alarm system installed in accordance with the provisions of this code and NFPA 72 shall be provided in new buildings and structures in accordance with Sections 907.2.1 through 907.2.23 and provide occupant notification in accordance with Section 907.5, unless other requirements are provided by another section of this code. [F]
A minimum of one manual fire alarm box shall be provided in an approved location to initiate a fire alarm signal for fire alarm systems employing automatic fire detectors or waterflow detection devices. Where other sections of this code allow elimination of fire alarm boxes due to sprinklers, a single fire alarm box shall be installed.
Exceptions:
1. The manual fire alarm box is not required for fire alarm systems dedicated to elevator recall control and supervisory service.
2. The manual fire alarm box is not required for Group R-2 occupancies unless required by the fire code official to provide a means for fire watch personnel to initiate an alarm during a sprinkler system impairment event. Where provided, the manual fire alarm box shall not be located in an area that is accessible to the public.
907.2.1
Group A. A manual fire
alarm system that activates the occupant notification system in accordance with
Section 907.5 shall be installed in Group A occupancies having an
occupant load of 300 or more. Portions of Group E occupancies
occupied for assembly purposes shall be provided with a fire alarm system as
required for the Group E occupancy. [F]
Exception: Manual fire alarm boxes are not required where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1 and the occupant notification appliances will activate throughout the notification zones upon sprinkler waterflow.
907.2.1.1
System initiation in Group A
occupancies with an occupant load of 1,000 or more. Activation of the
fire alarm in Group A occupancies with an occupant load of
1,000 or more shall initiate a signal using an emergency voice/alarm
communications system in accordance with Section 907.5.2.2. [F]
Exception: Where approved, the prerecorded announcement is allowed to be manually deactivated for a period of time, not to exceed 3 minutes, for the sole purpose of allowing a live voice announcement from an approved, constantly attended location.
907.2.2
Group B. A manual fire
alarm system shall be installed in Group B occupancies where one of the
following conditions exists: [F]
1. The
combined Group B occupant load of all floors is 500 or
more.
2. The Group B
occupant load is more than 100 persons above or below the
lowest level of
exit
discharge.
3. The
Group B fire area contains a Group B ambulatory health care
facility.
Exception: Manual fire alarm boxes are not required where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1 and the occupant notification appliances will activate throughout the notification zones upon sprinkler waterflow.
907.2.2.1
Group B ambulatory health
care facilities. Fire areas containing Group B ambulatory health care
facilities shall be provided with an electronically supervised automatic smoke
detection system installed within the ambulatory health care facility and in
public use areas outside of tenant spaces, including public
corridors and elevator lobbies. [F]
Exception: Buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1, provided the occupant notification appliances will activate throughout the notification zones upon sprinkler waterflow.
907.2.3
Group E. A manual fire alarm system that activates the occupant
notification system in accordance with Section 907.5 shall be installed in
Group E occupancies. When automatic sprinkler systems or smoke
detectors are installed, such systems or detectors shall be connected to the
building fire alarm system. [F]
Exceptions:
1. A manual fire alarm system is not required
in Group E occupancies with an occupant load of less than
50.
2. Manual fire alarm boxes are
not required in Group E occupancies where all of the following apply:
2.1. Interior corridors are
protected by smoke detectors.
2.2.
Auditoriums, cafeterias, gymnasiums and similar areas are protected by
heat detectors or other approved detection
devices.
2.3. Shops and laboratories
involving dusts or vapors are protected by heat detectors or
other approved detection devices.
2.4. The capability to activate the
evacuation signal from a central point is provided.
2.5. In buildings where normally occupied
spaces are provided with a two-way communication system between such spaces and
a constantly attended receiving station from where a general evacuation alarm
can be sounded, except in locations specifically designated by the fire code
official.
3. Manual fire
alarm boxes shall not be required in Group E occupancies where the building is
equipped throughout with an approved
automatic
sprinkler system installed in accordance with Section 903.3.1.1, the
notification appliances will activate on sprinkler waterflow and manual
activation is provided from a normally occupied location.
907.2.4
Group F. A manual fire
alarm system that activates the occupant notification system in accordance with
Section 907.5 shall be installed in Group F occupancies where both of the
following conditions exist: [F]
1. The Group F
occupancy is two or more stories in height; and
2. The Group F occupancy has a combined
occupant load of 500 or more above or below the lowest
level of exit
discharge.
Exception: Manual fire alarm boxes are not required where the building is equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1 and the occupant notification appliances will activate throughout the notification zones upon sprinkler waterflow.
907.2.5
Group H. A manual fire
alarm system that activates the occupant notification system shall be installed
in Group H-5 occupancies and in occupancies used for the manufacture of organic
coatings. An automatic smoke detection system that activates the occupant
notification system shall be installed for highly
toxic gases, organic peroxides and oxidizers in accordance
with Chapters 37, 39 and 40, respectively, of the International Fire
Code. [F]
907.2.6
Group I. A manual fire alarm system that activates the occupant
notification system shall be installed in Group I occupancies. An automatic
smoke detection system that activates the occupant notification system shall be
provided in accordance with Sections 907.2.6.1, 907.2.6.2 and 907.2.6.3.3. [F]
Exceptions:
1. Manual fire alarm boxes in resident or
patient sleeping areas of Group I-1 and I-2 occupancies shall not be required
at exits if located at all nurses' control stations or other
constantly attended staff locations, provided such stations are visible and
continuously accessible and that travel distances required in Section 907.4.2
are not exceeded.
2. Occupant
notification systems are not required to be activated where private mode
signaling installed in accordance with NFPA 72 is approved by
the fire code official.
907.2.6.1
Group
I-1. An automatic smoke detection system shall be installed in
corridors, waiting areas open to corridors
and habitable spaces other than sleeping
units and kitchens. The system shall be activated in accordance with
Section 907.5. [F]
Exceptions:
1. Smoke detection in habitable
spaces is not required where the facility is equipped throughout with
an automatic sprinkler system installed in accordance with
Section 903.3.1.1.
2. Smoke
detection is not required for exterior balconies.
907.2.6.1.1
Smoke alarms.
Single- and multiple-station smoke alarms shall be installed in accordance with
Section 907.2.11. [F]
907.2.6.2
Group I-2. An
automatic smoke detection system shall be installed in
corridors in nursing homes (both intermediate care and skilled
nursing facilities), detoxification facilities and spaces permitted to be open
to the corridors by Section 407.2. The system shall be
activated in accordance with Section 907.5. Hospitals shall be equipped with
smoke detection as required in Section 407. [F]
Exceptions:
1.
Corridor smoke detection
is not required in smoke compartments that contain patient sleeping units where
such units are provided with smoke detectors that comply with UL 268. Such
detectors shall provide a visual display on the corridor side
of each patient sleeping unit and shall provide an audible and
visual alarm at the nursing station attending each unit.
2.
Corridor smoke detection
is not required in smoke compartments that contain patient sleeping
units where patient sleeping unit doors are equipped
with automatic door-closing devices with integral smoke detectors on the unit
sides installed in accordance with their listing, provided that the integral
detectors perform the required alerting function.
907.2.6.3
Group I-3 occupancies.
Group I-3 occupancies shall be equipped with a manual fire alarm system and
automatic smoke detection system installed for alerting staff. [F]
907.2.6.3.1
System initiation.
Actuation of an automatic fire-extinguishing system, a manual fire alarm
box or a fire detector shall initiate an approved fire alarm
signal which automatically notifies staff. [F]
907.2.6.3.2
Manual fire alarm boxes.
Manual fire alarm boxes are not required to be located in accordance
with Section 907.4.2 where the fire alarm boxes are provided at staff-attended
locations having direct supervision over areas where manual fire alarm boxes
have been omitted. [F]
907.2.6.3.2.1
Manual fire alarm boxes in detainee areas. Manual fire alarm boxes
are allowed to be locked in areas occupied by detainees, provided that staff
members are present within the subject area and have keys readily available to
operate the manual fire alarm boxes.
907.2.6.3.3
Automatic smoke detection
system. An automatic smoke detection system shall be installed
throughout resident housing areas, including sleeping units
and contiguous day rooms, group activity spaces and other common spaces
normally accessible to residents. [F]
Exceptions:
1. Other approved smoke
detection arrangements providing equivalent protection, including, but not
limited to, placing detectors in exhaust ducts from cells or behind protective
guards listed for the purpose, are allowed when necessary to
prevent damage or tampering.
2.
Sleeping units in Occupancy Conditions 2 and 3 as described in
Section 308.
3. Smoke detectors are
not required in sleeping units with four or fewer occupants in
smoke compartments that are equipped throughout with an automatic
sprinkler system installed in accordance with Section
903.3.1.1.
907.2.7
Group M. A manual fire
alarm system that activates the occupant notification system in accordance with
Section 907.5 shall be installed in Group M occupancies where one of the
following conditions exists:[F]
1. The
combined Group M occupant load of all floors is 500 or more
persons.
2. The Group M
occupant load is more than 100 persons above or below the
lowest level of
exit
discharge.
Exceptions:
1. A manual fire alarm system is not required
in covered mall buildings complying with Section
402.
2. Manual fire
alarm boxes are not required where the building is equipped throughout with an
automatic sprinkler system installed in accordance with
Section 903.3.1.1 and the occupant notification appliances will automatically
activate throughout the notification zones upon sprinkler waterflow.
907.2.7.1
Occupant notification.
During times that the building is occupied, the initiation of a signal
from a manual fire alarm box or from a waterflow switch shall not be required
to activate the alarm notification appliances when an alarm signal is activated
at a constantly attended location from which evacuation
instructions shall be initiated over an emergency voice/alarm communication
system installed in accordance with Section 907.5.2.2. [F]
907.2.8
Group R-1.
Fire alarm systems and smoke alarms shall be installed in Group R-1
occupancies as required in Sections 907.2.8.1 through 907.2.8.3. [F]
907.2.8.1
Manual fire alarm system.
A manual fire alarm system that activates the occupant notification
system in accordance with Section 907.5 shall be installed in Group R-1
occupancies. [F]
Exceptions:
1. A manual fire alarm system is not required
in buildings not more than two stories in height where all
individual sleeping units and contiguous
attic and crawl spaces to those units are separated from each
other and public or common areas by at least 1-hour fire
partitions and each individual sleeping unit has an
exit directly to a public way,
egress
court or
yard.
2. Manual
fire alarm boxes are not required throughout the building when all of the
following conditions are met:
2.1. The
building is equipped throughout with an automatic sprinkler
system installed in accordance with Section 903.3.1.1 or
903.3.1.2;
2.2. The notification
appliances will activate upon sprinkler waterflow; and
2.3. At least one manual fire alarm box is
installed at an approved location.
907.2.8.2
Automatic smoke
detection system. An automatic smoke detection system that activates the
occupant notification system in accordance with Section 907.5 shall be
installed throughout all interior corridors serving
sleeping units. [F]
Exception: An automatic smoke detection system is not required in buildings that do not have interior corridors serving sleeping units and where each sleeping unit has a means of egress door opening directly to an exit or to an exterior exit access that leads directly to an exit.
907.2.8.3
Smoke alarms. Single-
and multiple-station smoke alarms shall be installed in accordance with Section
907.2.11. [F]
907.2.9
Group R-2. Fire alarm systems and smoke alarms shall be installed
in Group R-2 occupancies as required in Sections 907.2.9.1 and 907.2.9.2. [F]
907.2.9.1
Manual fire alarm system.
A manual fire alarm system that activates the occupant notification
system in accordance with Section 907.5 shall be installed in Group R-2
occupancies where: [F]
1. Any
dwelling
unit or sleeping
unit is located three or more stories above the
lowest level of
exit
discharge;
2. Any
dwelling
unit or sleeping
unit is located more than one story below the highest
level of
exit
discharge of
exits serving the dwelling
unit or sleeping unit; or
3. The building contains more than 16
dwelling
units or sleeping
units.
Exceptions:
1. A fire alarm system is not required in
buildings not more than two stories in height where all
dwelling
units or sleeping
units and contiguous attic and crawl spaces are
separated from each other and public or common areas by at least 1-hour
fire partitions and each dwelling
unit or sleeping unit has an
exit directly to a public way,
egress
court or
yard.
2. Manual
fire alarm boxes are not required where the building is equipped throughout
with an automatic sprinkler system installed in accordance
with Section 903.3.1.1 or 903.3.1.2 and the occupant notification appliances
will automatically activate throughout the notification zones upon a sprinkler
waterflow.
3. A fire alarm system
is not required in buildings that do not have interior
corridors serving dwelling
units and are protected by an approved
automatic sprinkler system installed in accordance with
Section 903.3.1.1 or 903.3.1.2, provided that dwelling
units either have a means of egress door
opening directly to an exterior exit
access
that leads directly to the exits or are served by open-ended
corridors designed in accordance with Section 1026.6,
Exception 4.
907.2.9.2
Smoke alarms. Single- and multiple-station smoke alarms shall be
installed in accordance with Section 907.2.11.[F]
907.2.10
Group R-4. Fire alarm
systems and smoke alarms shall be installed in Group R-4 occupancies as
required in Sections 907.2.10.1 through 907.2.10.3. [F]
907.2.10.1
Manual fire alarm system.
A manual fire alarm system that activates the occupant notification
system in accordance with Section 907.5 shall be installed in Group R-4
occupancies. [F]
Exceptions:
1. A manual fire alarm system is not required
in buildings not more than two stories in height where all
individual sleeping units and contiguous
attic and crawl spaces to those units are separated from each
other and public or common areas by at least 1-hour fire
partitions and each individual sleeping unit has an
exit directly to a public way,
exit
court or
yard.
2. Manual
fire alarm boxes are not required throughout the building when the following
conditions are met:
2.1. The building is
equipped throughout with an automatic sprinkler system
installed in accordance with Section 903.3.1.1 or 903.3.1.2;
2.2. The notification appliances will
activate upon sprinkler waterflow; and
2.3. At least one manual fire alarm box is
installed at an approved location.
3. Manual fire alarm boxes in resident or
patient sleeping areas shall not be required at exits where
located at all nurses' control stations or other constantly attended staff
locations, provided such stations are visible and continuously accessible and
that travel distances required in Section 907.4.2.1 are not
exceeded.
907.2.10.2
Automatic smoke detection system. An automatic smoke detection
system that activates the occupant notification system in accordance with
Section 907.5 shall be installed in corridors, waiting areas
open to corridors and habitable spaces other
than sleeping units and kitchens. [F]
Exceptions:
1. Smoke detection in habitable
spaces is not required where the facility is equipped throughout with
an automatic sprinkler system installed in accordance with
Section 903.3.1.1.
2. An automatic
smoke detection system is not required in buildings that do not have interior
corridors serving sleeping units and where
each sleeping unit has a means of egress door
opening directly to an exit or to an exterior
exit
access that leads directly to an
exit.
907.2.10.3
Smoke alarms. Single-
and multiple-station smoke alarms shall be installed in accordance with Section
907.2.11. [F]
907.2.11
Single- and multiple-station smoke alarms. Listed
single- and multiple-station smoke alarms complying with UL 217 shall be
installed in accordance with Sections 907.2.11.1 through 907.2.11.4 and NFPA
72. [F]
907.2.11.1
Group R-1.
Single- or multiple-station smoke alarms shall be installed in all of the
following locations in Group R-1: [F]
1. In
sleeping areas.
2. In every room in
the path of the means of egress from the sleeping area to the
door leading from the sleeping unit.
3. In each story within the
sleeping unit, including basements. For sleeping
units with split levels and without an intervening door between the
adjacent levels, a smoke alarm installed on the upper level shall suffice for
the adjacent lower level provided that the lower level is less than one full
story below the upper level.
907.2.11.2
Groups R-2, R-3, R-4 and
I-1. Single- or multiple-station smoke alarms shall be installed and
maintained in Groups R-2, R-3, R-4 and I-1 regardless of occupant
load at all of the following locations: [F]
1. On the ceiling or wall outside of each
separate sleeping area in the immediate vicinity of bedrooms.
2. In each room used for sleeping purposes.
Exception: Single- or multiple-station smoke alarms in Group I-1 occupanices shall not be required where smoke detectors are provided in the sleeping rooms as part of an automatic smoke detection system.
3. In each
story within a dwelling
unit, including basements but not including crawl spaces and
uninhabitable attics. In dwellings or
dwelling units with split levels and without an intervening
door between the adjacent levels, a smoke alarm installed on the upper level
shall suffice for the adjacent lower level provided that the lower level is
less than one full story below the upper level.
907.2.11.3
Interconnection. Where more than one smoke alarm is required to be
installed within an individual dwelling
unit
or sleeping unit in Group R-1, R-2, R-3 or R-4, the smoke
alarms shall be interconnected in such a manner that the activation of one
alarm will activate all of the alarms in the individual unit. The alarm shall
be clearly audible in all bedrooms over background noise levels with all
intervening doors closed. [F]
907.2.11.4
Power source. In new
construction, required smoke alarms shall receive their primary power from the
building wiring where such wiring is served from a commercial source and shall
be equipped with a battery backup. Smoke alarms with integral strobes that are
not equipped with battery backup shall be connected to an emergency electrical
system. Smoke alarms shall emit a signal when the batteries are low. Wiring
shall be permanent and without a disconnecting switch other than as required
for overcurrent protection. [F]
Exception: Smoke alarms are not required to be equipped with battery backup where they are connected to an emergency electrical system.
907.2.12
Special amusement
buildings. An automatic smoke detection system shall be provided in
special amusement buildings in accordance with Sections
907.2.12.1 through 907.2.12.3. [F]
907.2.12.1
Alarm. Activation of any single smoke detector, the
automatic sprinkler system or any other automatic fire
detection device shall immediately sound an alarm at the building at a
constantly attended location from which emergency action can
be initiated, including the capability of manual initiation of requirements in
Section 907.2.12.2. [F]
907.2.12.2
System response. The activation of two or more smoke detectors, a
single smoke detector equipped with an alarm verification feature, the
automatic sprinkler system or other approved
fire detection device shall automatically: [F]
1. Cause illumination of the means of
egress with light of not less than 1 footcandle (11 lux) at the
walking surface level;
2. Stop any
conflicting or confusing sounds and visual distractions;
3. Activate an approved
directional exit marking that will become apparent in an
emergency; and
4. Activate a
prerecorded message, audible throughout the special amusement
building, instructing patrons to proceed to the nearest
exit. Alarm signals used in conjunction with the prerecorded
message shall produce a sound which is distinctive from other sounds used
during normal operation.
907.2.12.3
Emergency voice/alarm
communication system. An emergency voice/alarm communication system,
which is also allowed to serve as a public address system, shall be installed
in accordance with Section 907.5.2.2 and be audible throughout the entire
special amusement building. [F]
907.2.13
High-rise buildings.
High-rise buildings shall be provided with an automatic smoke detection system
in accordance with Section 907.2.13.1, a fire department communication system
in accordance with Section 907.2.13.2 and an emergency voice/alarm
communication system in accordance with Section 907.5.2.2. [F]
Exceptions:
1. Airport traffic control towers in
accordance with Sections 907.2.22 and 412.
2.
Open parking garages in
accordance with Section 406.3.
3.
Buildings with an occupancy in Group A-5 in accordance with Section
303.1.
4. Low-hazard special
occupancies in accordance with Section 503.1.1.
5. Buildings with an occupancy in Group H-1,
H-2 or H-3 in accordance with Section 415.
6. In Group I-1 and I-2 occupancies, the
alarm shall sound at a constantly attended location and
general occupant notification shall be broadcast by the emergency voice/alarm
communication system.
907.2.13.1
Automatic smoke detection. Automatic smoke detection in high-rise
buildings shall be in accordance with Sections 907.2.13.1.1 and 907.2.13.1.2.
[F]
907.2.13.1.1
Area smoke
detection. Area smoke detectors shall be provided in accordance with
this section. Smoke detectors shall be connected to an automatic fire alarm
system. The activation of any detector required by this section shall operate
the emergency voice/alarm communication system in accordance with Section
907.5.2.2. Smoke detectors shall be located as follows: [F]
1. In each mechanical equipment, electrical,
transformer, telephone equipment or similar room which is not provided with
sprinkler protection.
2. In each
elevator machine room and in elevator lobbies.
907.2.13.1.2
Duct smoke
detection. Duct smoke detectors complying with Section 907.3.1 shall be
located as follows: [F]
1. In the main return
air and exhaust air plenum of each air-conditioning system having a capacity
greater than 2,000 cubic feet per minute (cfm) (0.94
m3/s). Such detectors shall be located in a
serviceable area downstream of the last duct inlet.
2. At each connection to a vertical duct or
riser serving two or more stories from a return air duct or plenum of an
air-conditioning system. In Group R-1 and R-2 occupancies, a smoke detector is
allowed to be used in each return air riser carrying not more than 5,000 cfm
(2.4 m3/s) and serving not more than 10 air inlet
openings.
907.2.13.2
Fire department
communication system. Where a wired communication system is
approved in lieu of a radio coverage system in accordance with
Section 510 of the International Fire Code, the wired fire
department communication system shall be designed and installed in accordance
with NFPA 72 and shall operate between a fire command center complying with
Section 911, elevators, elevator lobbies, emergency and standby power rooms,
fire pump rooms, areas of refuge and inside enclosed
exit
stairways. The fire department
communication device shall be provided at each floor level within the enclosed
exit
stairway. [F]
907.2.14
Atriums connecting
more than two stories. A fire alarm system shall be installed in
occupancies with an atrium that connects more than two
stories, with smoke detection installed throughout the atrium.
The system shall be activated in accordance with Section 907.5. Such
occupancies in Group A, E or M shall be provided with an emergency voice/alarm
communication system complying with the requirements of Section 907.5.2.2.
[F]
907.2.15
High-piled
combustible storage areas. An automatic smoke detection system shall be
installed throughout high-piled combustible storage areas where required by
Section 2306.5 of the International Fire Code. [F]
907.2.16
Aerosol storage uses.
Aerosol storage rooms and general-purpose warehouses containing aerosols shall
be provided with an approved manual fire alarm system where
required by the International Fire Code. [F]
907.2.17
Lumber, wood structural panel
and veneer mills. Lumber, wood structural panel and veneer mills shall
be provided with a manual fire alarm system. [F]
907.2.18
Underground buildings with
smoke control systems. Where a smoke control system is installed in an
underground building in accordance with this code, automatic smoke detectors
shall be provided in accordance with Section 907.2.18.1. [F]
907.2.18.1
Smoke detectors. A
minimum of one smoke detector listed for the intended purpose
shall be installed in the following areas: [F]
1. Mechanical equipment, electrical,
transformer, telephone equipment, elevator machine or similar rooms.
2. Elevator lobbies.
3. The main return and exhaust air plenum of
each air-conditioning system serving more than one story and
located in a serviceable area downstream of the last duct inlet.
4. Each connection to a vertical duct or
riser serving two or more floors from return air ducts or plenums of heating,
ventilating and air-conditioning systems, except that in Group R occupancies, a
listed smoke detector is allowed to be used in each return air
riser carrying not more than 5,000 cfm (2.4 m3/s)
and serving not more than 10 air inlet openings.
907.2.18.2
Alarm required.
Activation of the smoke control system shall activate an audible alarm at a
constantly attended location. [F]
907.2.19
Deep underground
buildings. Where the lowest level of a structure is more than 60 feet
(18 288 mm) below the finished floor of the lowest level of
exit
discharge, the structure shall be
equipped throughout with a manual fire alarm system, including an emergency
voice/alarm communication system installed in accordance with Section
907.5.2.2. [F]
907.2.20
Covered mall buildings.
Covered mall buildings
exceeding 50,000 square feet (4645 m2) in total
floor area shall be provided with an emergency voice/alarm communication
system. An emergency voice/alarm communication system serving a mall, required
or otherwise, shall be accessible to the fire department. The system shall be
provided in accordance with Section 907.5.2.2. [F]
907.2.21
Residential aircraft
hangars. A minimum of one single-station smoke alarm shall be installed
within a residential aircraft hangar as defined in Section 412.3.1 and shall be
interconnected into the residential smoke alarm or other sounding device to
provide an alarm which will be audible in all sleeping areas of the
dwelling. [F]
907.2.22
Airport traffic control
towers. An automatic smoke detection system that activates the occupant
notification system in accordance with Section 907.5 shall be provided in
airport control towers in all occupiable and equipment spaces. [F]
Exception: Audible appliances shall not be installed within the control tower cab.
907.2.23
Battery rooms. An
automatic smoke detection system shall be installed in areas containing
stationary storage battery systems with a liquid capacity of more than 50
gallons (189 L). [F]
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