Page 83 - 2018_IMC

EXHAUST SYSTEMS

[F] 513.10 Equipment. Equipment such as, but not limited ments of the International Building Code. Motors driving
to, fans, ducts, automatic dampers and balance dampers shall fans shall not be operating beyond their nameplate horse-
be suitable for their intended use, suitable for the probable power (kilowatts) as determined from measurement of
exposure temperatures that the rational analysis indicates, and actual current draw. Motors driving fans shall have a min-
as approved by the code official. imum service factor of 1.15.
[F] 513.10.1 Exhaust fans. Components of exhaust fans [F] 513.11 Standby power. The smoke control system shall
shall be rated and certified by the manufacturer for the be supplied with standby power in accordance with Section
probable temperature rise to which the components will be 2702 of the International Building Code.
exposed. This temperature rise shall be computed by:
[F] 513.11.1 Equipment room. The standby power
T = (Q /mc) + (T ) (Equation 5-3) source and its transfer switches shall be in a room separate
a
s
c
where: from the normal power transformers and switch gear and
ventilated directly to and from the exterior. The room shall
c = Specific heat of smoke at smoke-layer temperature, be enclosed with not less than 1-hour fire-resistance-rated
Btu/lb°F (kJ/kg • K).
fire barriers constructed in accordance with Section 707 of
m = Exhaust rate, pounds per second (kg/s). the International Building Code or horizontal assemblies
Q = Convective heat output of fire, Btu/s (kW). constructed in accordance with Section 711 of the Interna-
c
tional Building Code, or both.
T = Ambient temperature, °F (K).
a
[F] 513.11.2 Power sources and power surges. Elements
T = Smoke temperature, °F (K).
s
of the smoke management system relying on volatile
Exception: Reduced T as calculated based on the
s memories or the like shall be supplied with uninterruptible
assurance of adequate dilution air.
power sources of sufficient duration to span 15-minute pri-
[F] 513.10.2 Ducts. Duct materials and joints shall be mary power interruption. Elements of the smoke manage-
capable of withstanding the probable temperatures and ment system susceptible to power surges shall be suitably
pressures to which they are exposed as determined in protected by conditioners, suppressors or other approved
accordance with Section 513.10.1. Ducts shall be con- means.
structed and supported in accordance with Chapter 6. [F] 513.12 Detection and control systems. Fire detection
Ducts shall be leak tested to 1.5 times the maximum systems providing control input or output signals to mechani-
design pressure in accordance with nationally accepted cal smoke control systems or elements thereof shall comply
practices. Measured leakage shall not exceed 5 percent of with the requirements of Section 907 of the International
design flow. Results of such testing shall be a part of the Building Code. Such systems shall be equipped with a control
documentation procedure. Ducts shall be supported unit complying with UL 864 and listed as smoke control
directly from fire-resistance-rated structural elements of equipment.
the building by substantial, noncombustible supports.
[F] 513.12.1 Verification. Control systems for mechani-
Exception: Flexible connections, for the purpose of
vibration isolation, that are constructed of approved cal smoke control systems shall include provisions for ver-
fire-resistance-rated materials. ification. Verification shall include positive confirmation
[F] 513.10.3 Equipment, inlets and outlets. Equipment of actuation, testing, manual override and the presence of
power downstream of all disconnects. A preprogrammed
shall be located so as to not expose uninvolved portions of weekly test sequence shall report abnormal conditions
the building to an additional fire hazard. Outdoor air inlets audibly, visually and by printed report. The prepro-
shall be located so as to minimize the potential for intro- grammed weekly test shall operate all devices, equipment
ducing smoke or flame into the building. Exhaust outlets and components used for smoke control.
shall be so located as to minimize reintroduction of smoke
into the building and to limit exposure of the building or Exception: Where verification of individual compo-
adjacent buildings to an additional fire hazard. nents tested through the preprogrammed weekly testing
sequence will interfere with, and produce unwanted
[F] 513.10.4 Automatic dampers. Automatic dampers, effects to, normal building operation, such individual
regardless of the purpose for which they are installed components are permitted to be bypassed from the pre-
within the smoke control system, shall be listed and con- programmed weekly testing, where approved by the
form to the requirements of approved recognized stan- building official and in accordance with both of the fol-
dards.
lowing:
[F] 513.10.5 Fans. In addition to other requirements, belt-
driven fans shall have 1.5 times the number of belts 1. Where the operation of components is bypassed
required for the design duty with the minimum number of from the preprogrammed weekly test, presence of
belts being two. Fans shall be selected for stable perfor- power downstream of all disconnects shall be
mance based on normal temperature and, where applica- verified weekly by a listed control unit.
ble, elevated temperature. Calculations and manufacturer’s 2. Testing of all components bypassed from the pre-
fan curves shall be part of the documentation procedures. programmed weekly test shall be in accordance
Fans shall be supported and restrained by noncombustible with Section 909.20.6 of the International Fire
devices in accordance with the structural design require- Code.

66 2018 INTERNATIONAL MECHANICAL CODE 
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