Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 4 - Special Detailed Requirements Based on Use and Occupancy
Section 415 - GROUPS H-1, H-2, H-3, H-4 AND H-5
Subsection 415.8 - Group H-5
Universal Citation: 780 CMR MA Code of Regs 415.8
Current through Register 1531, September 27, 2024
[F]
415.8.1 General. In addition to the requirements set forth elsewhere in this code, Group H-5 shall comply with the provisions of Sections 415.8.1 through 415.8.11 and the International Fire Code. [F]
415.8.2 Fabrication areas. [F]
415.8.2.1
Hazardous materials in
fabrication areas. [F]
415.8.2.1.1
Aggregate quantities. The aggregate quantities of hazardous
materials stored and used in a single fabrication area shall not exceed the
quantities set forth in Table 415.8.2.1.1. [F]
Exception: The quantity limitations for any hazard category in Table 415.8.2.1.1 shall not apply where the fabrication area contains quantities of hazardous materials not exceeding the maximum allowable quantities per control area established by Tables 307.1(1) and 307.1(2).
TABLE 415.8.2.1.1 QUANTITY LIMITS FOR HAZARDOUS MATERIALS IN A SINGLE FABRICATION AREA IN GROUP H-5a [F]
| HAZARD CATEGORY | SOLIDS (pounds per square feet) | LIQUIDS (gallons per square feet) | GAS (feet3 @ NTP/square feet) | ||||
| PHYSICAL-HAZARD MATERIALS | |||||||
| Combustible dust | Note b | Not Applicable | Not Applicable | ||||
| Combustible fiber | Loose | Note b | Not Applicable | Not Applicable | |||
| Baled | Notes b, c | ||||||
| Combustible liquid | II | Not Applicable | 0.01 | Not Applicable | |||
| IIIA | 0.02 | ||||||
| IIIB | Not Limited | ||||||
| Combination Class I, II and IIIA | 0.04 | ||||||
| Cryogenic gas | Flammable | Not Applicable | Not Applicable | Note d | |||
| Oxidizing | 1.25 | ||||||
| Explosives | Note b | Note b | Note b | ||||
| Flammable gas | Gaseous | Not Applicable | Not Applicable | Note d | |||
| Liquefied | Note d | ||||||
| Flammable liquid | IA | Not Applicable | 0.0025 | Not Applicable | |||
| IB | 0.025 | ||||||
| IC | 0.025 | ||||||
| Combination Class IA, IB and IC | 0.025 | ||||||
| Combination Class I, II and IIIA | 0.04 | ||||||
| Flammable solid | 0.001 | Not Applicable | Not Applicable | ||||
| Organic peroxide | Not Applicable | Not Applicable | |||||
| Unclassified detonable | Note b | ||||||
| Class I | Note b | ||||||
| Class II | 0.025 | ||||||
| Class III | 0.1 | ||||||
| Class IV | Not Limited | ||||||
| Class V | Not limited | ||||||
| Oxidizing gas | Gaseous | Not Applicable | Not Applicable | 1.25 | |||
| Liquefied | 1.25 | ||||||
| Combination of gaseous and liquefied | 1.25 | ||||||
| Oxidizer | Class 4 | Note b | Note b | Not Applicable | |||
| Class 3 | 0.003 | 0.03 | |||||
| Class 2 | 0.003 | 0.03 | |||||
| Class 1 | 0.003 | 0.03 | |||||
| Combination | Class 1, 2, 3 | 0.003 | 0.03 | ||||
| Pyrophoric material | Note b | 0.00125 | Notes d and e | ||||
| Unstable reactive | Class 4 | Note b | Note b | Note b | |||
| Class 3 | 0.025 | 0.0025 | Note b | ||||
| Class 2 | 0.1 | 0.01 | Note b | ||||
| Class 1 | Not Limited | Not Limited | Not Limited | ||||
| Water reactive | Class 3 | Note b | 0.00125 | Not Applicable | |||
| Class 2 | 0.25 | 0.025 | |||||
| Class 1 | Not Limited | Not Limited | |||||
| HEALTH-HAZARD MATERIALS | |||||||
| Corrosives | Not Limited | Not Limited | Not Limited | ||||
| Highly toxic | Not Limited | Not Limited | Note d | ||||
| Toxics | Not Limited | Not Limited | Note d | ||||
| For SI: 1 pound per square foot = 4.882
kg/m2, 1 gallon per square foot = 40.7
L/m2, 1 cubic foot @ NTP/square foot = 0.305
m3 @ NTP/m2, 1 cubic foot = 0.02832 m3. a. Hazardous materials within piping shall not be included in the calculated quantities. b. Quantity of hazardous materials in a single fabrication shall not exceed the maximum allowable quantities per control area in Tables 307.1(1) and 307.1(2). c. Densely packed baled cotton that complies with the packing requirements of ISO 8115 shall not be included in this material class. d. The aggregate quantity of flammable, pyrophoric, toxic and highly toxic gases shall not exceed 9,000 cubic feet at NTP. e. The aggregate quantity of pyrophoric gases in the building shall not exceed the amounts set forth in Table 415.3.2. |
415.8.2.1.2
Hazardous production
materials. The maximum quantities of hazardous production materials
(HPM) stored in a single fabrication area shall not exceed the maximum
allowable quantities per control area established by Tables
307.1(1) and 307.1(2). [F]
415.8.2.2
Separation.
Fabrication areas, whose sizes are limited by the quantity of hazardous
materials allowed by Table 415.8.2.1.1, shall be separated from each other,
from corridors and from other parts of the building by not
less than 1-hour fire barriers constructed in accordance with
Section 707 or horizontal assemblies constructed in accordance
with Section 712, or both. [F]
Exceptions:
1. Doors within such fire
barrier walls, including doors to corridors, shall be
only self-closing fire door
assemblies having
a fire protection rating of not less than
3/4 hour.
2. Windows between fabrication areas and
corridors are permitted to be fixed glazing listed and labeled
for a fire protection rating of at least
3/4 hour in accordance with
Section 715.
415.8.2.3
Location of occupied levels. Occupied levels of fabrication areas
shall be located at or above the first story
above
grade plane. [F]
415.8.2.4
Floors. Except for
surfacing, floors within fabrication areas shall be of noncombustible
construction. [F]
Openings through floors of fabrication areas are permitted to be unprotected where the interconnected levels are used solely for mechanical equipment directly related to such fabrication areas (see also Section 415.8.2.5).
Floors forming a part of an occupancy separation shall be liquid tight.
415.8.2.5
Shafts and openings through floors. Elevator shafts, vent shafts
and other openings through floors shall be enclosed when required by Section
708. Mechanical, duct and piping penetrations within a fabrication area shall
not extend through more than two floors. The annular space
around penetrations for cables, cable trays, tubing, piping, conduit
or ducts shall be sealed at the floor level to restrict the movement of air.
The fabrication area, including the areas through which the ductwork and piping
extend, shall be considered a single conditioned environment. [F]
415.8.2.6
Ventilation.
Mechanical exhaust ventilation at the rate of not less than 1 cubic foot per
minute per square foot [0.0051 m3/(s ·
m2)] of floor area shall be provided throughout the
portions of the fabrication area where HPM are used or stored. The exhaust air
duct system of one fabrication area shall not connect to another duct system
outside that fabrication area within the building. [F]
A ventilation system shall be provided to capture and exhaust gases, fumes and vapors at workstations.
Two or more operations at a workstation shall not be connected to the same exhaust system where either one or the combination of the substances removed could constitute a fire, explosion or hazardous chemical reaction within the exhaust duct system.
Exhaust ducts penetrating occupancy separations shall be contained in a shaft of equivalent fire-resistance-rated construction. Exhaust ducts shall not penetrate fire walls.
Fire dampers shall not be installed in exhaust ducts.
415.8.2.7
Transporting hazardous production materials to fabrication areas.
HPM shall be transported to fabrication areas through enclosed piping or tubing
systems that comply with Section 415.8.6.1, through service
corridors complying with Section 415.8.4, or in
corridors as permitted in the exception to Section 415.8.3.
The handling or transporting of HPM within service corridors
shall comply with the International Fire Code. [F]
415.8.2.8
Electrical. [F]
415.8.2.8.1
General. Electrical
equipment and devices within the fabrication area shall comply with NFPA 70.
The requirements for hazardous locations need not be applied where the average
air change is at least four times that set forth in Section 415.8.2.6 and where
the number of air changes at any location is not less than three times that
required by Section 415.8.2.6. The use of recirculated air shall be permitted.
[F]
415.8.2.8.2
Workstations. Workstations shall not be energized without adequate
exhaust ventilation. See Section 415.8.2.6 for workstation exhaust ventilation
requirements. [F]
415.8.3 Corridors. Corridors shall comply with Chapter 10 and shall be separated from fabrication areas as specified in Section 415.8.2.2. Corridors shall not contain HPM and shall not be used for transporting such materials, except through closed piping systems as provided in Section 415.8.6.3. [F]
Exception: Where existing fabrication areas are altered or modified, HPM is allowed to be transported in existing corridors, subject to the following conditions:
1. Corridors. Corridors
adjacent to the fabrication area where the alteration work is
to be done shall comply with Section 1018 for a length determined as follows:
1.1. The length of the common wall of the
corridor and the fabrication area; and
1.2. For the distance along the
corridor to the point of entry of HPM into the
corridor serving that fabrication area.
2. Emergency alarm system. There shall be an
emergency telephone system, a local manual alarm station or other
approved alarm-initiating device within
corridors at not more than 150-foot (45 720 mm) intervals and
at each exit and doorway. The signal shall be relayed to an
approved central, proprietary or remote station service or the
emergency control station and shall also initiate a local audible
alarm.
3. Pass-throughs.
Self-closing doors having a fire protection rating of not less
than 1 hour shall separate pass-throughs from existing
corridors. Pass-throughs shall be constructed as required for
the corridors and protected by an approved
automatic fire-extinguishing system.
415.8.4 Service corridors. [F]
415.8.4.1
Occupancy. Service
corridors shall be classified as Group H-5. [F]
415.8.4.2
Use conditions.
Service corridors shall be separated from corridors as
required by Section 415.8.2.2. Service corridors shall not be used as a
required corridor. [F]
415.8.4.3
Mechanical
ventilation. Service corridors shall be mechanically ventilated as
required by Section 415.8.2.6 or at not less than six air changes per hour,
whichever is greater. [F]
415.8.4.4
Means of egress. The maximum distance of travel from any point in
a service corridor to an exit, exit
access
corridor or door into a fabrication
area shall not exceed 75 feet (22 860 mm). Dead ends shall not exceed 4 feet
(1219 mm) in length. There shall be not less than two exits,
and not more than one-half of the required means of egress
shall require travel into a fabrication area. Doors from service corridors
shall swing in the direction of egress travel and shall be self-closing.
[F]
415.8.4.5
Minimum
width. The minimum clear width of a service corridor shall be 5 feet
(1524 mm), or 33 inches (838 mm) wider than the widest cart or truck used in
the corridor, whichever is greater. [F]
415.8.4.6
Emergency alarm
system. Emergency alarm systems shall be provided in accordance with
this section and Sections 414.7.1 and 414.7.2. The maximum allowable quantity
per control area provisions shall not apply to emergency alarm
systems required for HPM. [F]
415.8.4.6.1
Service corridors. An emergency alarm system shall be provided in
service corridors, with at least one alarm device in each service corridor.
[F]
415.8.4.6.2
Exit access
corridors and exit enclosures. Emergency alarms for
exit
access corridors and
exit
enclosures shall comply with Section
414.7.2. [F]
415.8.4.6.3
Liquid storage rooms, HPM rooms and gas rooms. Emergency alarms for
liquid storage rooms, HPM rooms and gas rooms shall comply with Section
414.7.1. [F]
415.8.4.6.4
Alarm-initiating devices. An approved emergency
telephone system, local alarm manual pull stations, or other
approved alarm-initiating devices are allowed to be used as
emergency alarm-initiating devices. [F]
415.8.4.6.5
Alarm signals.
Activation of the emergency alarm system shall sound a local alarm and transmit
a signal to the emergency control station. [F]
415.8.5 Storage of hazardous production materials. [F]
415.8.5.1
General. Storage of HPM in fabrication areas shall be within
approved or listed storage cabinets or gas
cabinets or within a workstation. The storage of HPM in quantities greater than
those listed in Section 1804.2 of the International Fire Code
shall be in liquid storage rooms, HPM rooms or gas rooms as appropriate for the
materials stored. The storage of other hazardous materials shall be in
accordance with other applicable provisions of this code and the
International Fire Code. [F]
415.8.5.2
Construction. [F]
415.8.5.2.1
HPM rooms and gas
rooms. HPM rooms and gas rooms shall be separated from other areas by
fire barriers constructed in accordance with Section 707 or
horizontal assemblies constructed in accordance with Section
712, or both. The minimum fire-resistance rating shall be 2
hours where the area is 300 square feet (27.9 m2) or
more and 1 hour where the area is less than 300 square feet (27.9
m2). [F]
415.8.5.2.2
Liquid storage
rooms. Liquid storage rooms shall be constructed in accordance with the
following requirements: [F]
1. Rooms in excess
of 500 square feet (46.5 m2) shall have at least one
exterior door approved for fire department access.
2. Rooms shall be separated from other areas
by fire barriers constructed in accordance with Section 707 or
horizontal assemblies constructed in accordance with Section
712, or both. The fire-resistance rating shall be not less
than 1 hour for rooms up to 150 square feet (13.9
m2) in area and not less than 2 hours where the room
is more than 150 square feet (13.9 m2) in
area.
3. Shelving, racks and
wainscotting in such areas shall be of noncombustible construction or wood of
not less than 1-inch (25 mm) nominal thickness.
4. Rooms used for the storage of Class I
flammable liquids shall not be located in a basement.
415.8.5.2.3
Floors. Except for
surfacing, floors of HPM rooms and liquid storage rooms shall be of
noncombustible liquid-tight construction. Raised grating over floors shall be
of noncombustible materials. [F]
415.8.5.3
Location. Where HPM
rooms, liquid storage rooms and gas rooms are provided, they shall have at
least one exterior wall and such wall shall be not less than
30 feet (9144 mm) from lot lines, including lot
lines adjacent to public ways. [F]
415.8.5.4
Explosion control.
Explosion control shall be provided where required by Section 414.5.1.
[F]
415.8.5.5
Exits.
Where two exits are required from HPM rooms, liquid storage rooms and gas
rooms, one shall be directly to the outside of the building. [F]
415.8.5.6
Doors. Doors in a
fire barrier wall, including doors to
corridors, shall be self-closing fire door
assemblies having a fire-protection rating of
not less than 3/4 hour.
[F]
415.8.5.7
Ventilation. Mechanical exhaust ventilation shall be provided in liquid
storage rooms, HPM rooms and gas rooms at the rate of not less than 1 cubic
foot per minute per square foot [0.0051 m3/(s
· m2)] of floor area or six air changes per
hour, whichever is greater, for categories of material. [F]
Exhaust ventilation for gas rooms shall be designed to operate at a negative pressure in relation to the surrounding areas and direct the exhaust ventilation to an exhaust system.
415.8.5.8
Emergency alarm
system. An approved emergency alarm system shall be
provided for HPM rooms, liquid storage rooms and gas rooms. [F]
Emergency alarm-initiating devices shall be installed outside of each interior exit door of such rooms.
Activation of an emergency alarm-initiating device shall sound a local alarm and transmit a signal to the emergency control station.
An approved emergency telephone system, local alarm manual pull stations or other approved alarm-initiating devices are allowed to be used as emergency alarm-initiating devices.
415.8.6 Piping and tubing. [F]
415.8.6.1
General. Hazardous production materials piping and tubing shall
comply with this section and ASME B31.3. [F]
415.8.6.2
Supply piping and
tubing. [F]
415.8.6.2.1
HPM
having a health-hazard ranking of 3 or 4. Systems supplying HPM liquids
or gases having a health-hazard ranking of 3 or 4 shall be welded throughout,
except for connections, to the systems that are within a ventilated enclosure
if the material is a gas, or an approved method of drainage or
containment is provided for the connections if the material is a liquid.
[F]
415.8.6.2.2
Location in
service corridors. Hazardous production materials supply piping or
tubing in service corridors shall be exposed to view. [F]
415.8.6.2.3
Excess flow control.
Where HPM gases or liquids are carried in pressurized piping above 15 pounds
per square inch gauge (psig) (103.4 kPa), excess flow control shall be
provided. Where the piping originates from within a liquid storage room, HPM
room or gas room, the excess flow control shall be located within the liquid
storage room, HPM room or gas room. Where the piping originates from a bulk
source, the excess flow control shall be located as close to the bulk source as
practical. [F]
415.8.6.3
Installations in corridors and above other occupancies. The
installation of HPM piping and tubing within the space defined by the walls of
corridors and the floor or roof above, or in concealed spaces
above other occupancies, shall be in accordance with Section 415.8.6.2 and the
following conditions: [F]
1. Automatic
sprinklers shall be installed within the space unless the space is less than 6
inches (152 mm) in the least dimension.
2. Ventilation not less than six air changes
per hour shall be provided. The space shall not be used to convey air from any
other area.
3. Where the piping or
tubing is used to transport HPM liquids, a receptor shall be installed below
such piping or tubing. The receptor shall be designed to collect any discharge
or leakage and drain it to an approved location. The 1-hour
enclosure shall not be used as part of the receptor.
4. HPM supply piping and tubing and
nonmetallic waste lines shall be separated from the corridor
and from occupancies other than Group H-5 by fire barriers
that have a fire-resistance rating of not less than 1 hour.
Where gypsum wallboard is used, joints on the piping side of the enclosure are
not required to be taped, provided the joints occur over framing members.
Access openings into the enclosure shall be protected by
approved fire protection-rated assemblies.
5. Readily accessible manual or automatic
remotely activated fail-safe emergency shutoff valves shall be installed on
piping and tubing other than waste lines at the following locations:
5.1. At branch connections into the
fabrication area.
5.2. At entries
into corridors.
Exception: Transverse crossings of the corridors by supply piping that is enclosed within a ferrous pipe or tube for the width of the corridor need not comply with Items 1 through 5.
415.8.6.4
Identification.
Piping, tubing and HPM waste lines shall be identified in accordance with ANSI
A13.1 to indicate the material being transported. [F]
415.8.7 Continuous gas detection systems. A continuous gas detection system shall be provided for HPM gases when the physiological warning threshold level of the gas is at a higher level than the accepted PEL for the gas and for flammable gases in accordance with Sections 415.8.7.1 and 415.8.7.2. [F]
415.8.7.1
Where required. A
continuous gas detection system shall be provided in the areas identified in
Sections 415.8.7.1.1 through 415.8.7.1.4. [F]
415.8.7.1.1
Fabrication areas. A
continuous gas detection system shall be provided in fabrication areas when gas
is used in the fabrication area. [F]
415.8.7.1.2
HPM rooms. A
continuous gas detection system shall be provided in HPM rooms when gas is used
in the room. [F]
415.8.7.1.3
Gas cabinets, exhausted enclosures and gas rooms. A continuous gas
detection system shall be provided in gas cabinets and exhausted enclosures. A
continuous gas detection system shall be provided in gas rooms when gases are
not located in gas cabinets or exhausted enclosures. [F]
415.8.7.1.4
Corridors. When
gases are transported in piping placed within the space defined by the walls of
a corridor and the floor or roof above the
corridor, a continuous gas detection system shall be provided
where piping is located and in the corridor. [F]
Exception: A continuous gas detection system is not required for occasional transverse crossings of the corridors by supply piping that is enclosed in a ferrous pipe or tube for the width of the corridor.
415.8.7.2
Gas detection system
operation. The continuous gas detection system shall be capable of
monitoring the room, area or equipment in which the gas is located at or below
all the following gas concentrations: [F]
1.
Immediately dangerous to life and health (IDLH) values when the monitoring
point is within an exhausted enclosure, ventilated enclosure or gas
cabinet.
2. Permissible exposure
limit (PEL) levels when the monitoring point is in an area outside an exhausted
enclosure, ventilated enclosure or gas cabinet.
3. For flammable gases, the monitoring
detection threshold level shall be vapor concentrations in excess of 25 percent
of the lower flammable limit (LFL) when the monitoring is within or outside an
exhausted enclosure, ventilated enclosure or gas cabinet.
4. Except as noted in this section,
monitoring for highly
toxic and
toxic gases shall also comply with Chapter 37 of the
International Fire Code.
415.8.7.2.1
Alarms. The gas
detection system shall initiate a local alarm and transmit a signal to the
emergency control station when a short-term hazard condition is detected. The
alarm shall be both visual and audible and shall provide warning both inside
and outside the area where the gas is detected. The audible alarm shall be
distinct from all other alarms. [F]
415.8.7.2.2
Shutoff of gas
supply. The gas detection system shall automatically close the shutoff
valve at the source on gas supply piping and tubing related to the system being
monitored for which gas is detected when a short-term hazard condition is
detected. Automatic closure of shutoff valves shall comply with the following:
[F]
1. Where the gas detection sampling point
initiating the gas detection system alarm is within a gas cabinet or exhausted
enclosure, the shutoff valve in the gas cabinet or exhausted enclosure for the
specific gas detected shall automatically close.
2. Where the gas detection sampling point
initiating the gas detection system alarm is within a room and compressed gas
containers are not in gas cabinets or an exhausted enclosure, the shutoff
valves on all gas lines for the specific gas detected shall automatically
close.
3. Where the gas detection
sampling point initiating the gas detection system alarm is within a piping
distribution manifold enclosure, the shutoff valve supplying the manifold for
the compressed gas container of the specific gas detected shall automatically
close.
Exception: Where the gas detection sampling point initiating the gas detection system alarm is at the use location or within a gas valve enclosure of a branch line downstream of a piping distribution manifold, the shutoff valve for the branch line located in the piping distribution manifold enclosure shall automatically close.
415.8.8 Manual fire alarm system. An approved manual fire alarm system shall be provided throughout buildings containing Group H-5. Activation of the alarm system shall initiate a local alarm and transmit a signal to the emergency control station. The fire alarm system shall be designed and installed in accordance with Section 907. [F]
415.8.9 Emergency control station. An emergency control station shall be provided in accordance with Sections 415.8.9.1 through 415.8.9.3. [F]
415.8.9.1
Location. The
emergency control station shall be located on the premises at an
approved location outside the fabrication area. [F]
415.8.9.2
Staffing. Trained
personnel shall continuously staff the emergency control station. [F]
415.8.9.3
Signals. The emergency
control station shall receive signals from emergency equipment and alarm and
detection systems. Such emergency equipment and alarm and detection systems
shall include, but not be limited to, the following where such equipment or
systems are required to be provided either in this chapter or elsewhere in this
code: [F]
1.
Automatic sprinkler
system alarm and monitoring systems.
2. Manual fire alarm systems.
3. Emergency alarm systems.
4. Continuous gas detection
systems.
5. Smoke detection
systems.
6. Emergency power
system.
7. Automatic detection and
alarm systems for pyrophoric liquids and Class 3 water-reactive liquids
required in Section 1805.2.3.4 of the International Fire
Code.
8. Exhaust
ventilation flow alarm devices for pyrophoric liquids and Class 3
water-reactive liquids cabinet exhaust ventilation systems required in Section
1805.2.3.4 of the International Fire Code.
415.8.10 Emergency power system. An emergency power system shall be provided in Group H-5 occupancies where required in Section 415.8.10.1. The emergency power system shall be designed to supply power automatically to required electrical systems when the normal electrical supply system is interrupted. [F]
415.8.10.1
Required electrical
systems. Emergency power shall be provided for electrically operated
equipment and connected control circuits for the following systems: [F]
1. HPM exhaust ventilation systems.
2. HPM gas cabinet ventilation
systems.
3. HPM exhausted enclosure
ventilation systems.
4. HPM gas
room ventilation systems.
5. HPM
gas detection systems.
6. Emergency
alarm systems.
7. Manual fire alarm
systems.
8.
Automatic
sprinkler system monitoring and alarm systems.
9. Automatic alarm and detection systems for
pyrophoric liquids and Class 3 water-reactive liquids required in Section
1805.2.3.4 of the International Fire Code.
10. Flow alarm switches for pyrophoric
liquids and Class 3 water-reactive liquids cabinet exhaust ventilation systems
required in Section 1805.2.3.4 of the International Fire
Code.
11. Electrically
operated systems required elsewhere in this code or in the
International Fire Code applicable to the use, storage or
handling of HPM.
415.8.10.2
Exhaust ventilation
systems. Exhaust ventilation systems are allowed to be designed to
operate at not less than one-half the normal fan speed on the emergency power
system where it is demonstrated that the level of exhaust will maintain a safe
atmosphere. [F]
415.8.11 Automatic sprinkler system protection in exhaust ducts for HPM. [F]
415.8.11.1
Exhaust ducts for
HPM. An approved
automatic sprinkler
system shall be provided in exhaust ducts conveying gases, vapors,
fumes, mists or dusts generated from HPM in accordance with this section and
the International Mechanical Code. [F]
415.8.11.2
Metallic and noncombustible
nonmetallic exhaust ducts. An approved
automatic sprinkler system shall be provided in metallic and
noncombustible nonmetallic exhaust ducts when all of the following conditions
apply: [F]
1. Where the largest
cross-sectional diameter is equal to or greater than 10 inches (254
mm).
2. The ducts are within the
building.
3. The ducts are
conveying flammable gases, vapors or fumes.
415.8.11.3
Combustible nonmetallic
exhaust ducts.
Automatic sprinkler system protection
shall be provided in combustible nonmetallic exhaust ducts where the largest
cross-sectional diameter of the duct is equal to or greater than 10 inches (254
mm). [F]
Exceptions:
1. Ducts listed or
approved for applications without automatic fire sprinkler
system protection.
2. Ducts not
more than 12 feet (3658 mm) in length installed below ceiling level.
415.8.11.4
Automatic
sprinkler locations. Sprinkler systems shall be installed at 12-foot
(3658 mm) intervals in horizontal ducts and at changes in direction. In
vertical ducts, sprinklers shall be installed at the top and at alternate floor
levels. [F]
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