Page 173 - 2018_IFC

FIRE PROTECTION AND LIFE SAFETY SYSTEMS

containing high-piled combustible storage equipped minimum rate of two air changes per hour based on the
throughout with an automatic sprinkler system in accor- volume of the building or portion thereof without contents.
dance with Section 903.3.1.1, a smoke and heat removal The capacity of each exhaust fan shall not exceed 30,000
3
system shall be installed in accordance with Section 910.3 cubic feet per minute (14.2 m /s).
or 910.4. In occupied portions of a building equipped 910.4.3.1 Makeup air. Makeup air openings shall be
throughout with an automatic sprinkler system in accor- provided within 6 feet (1829 mm) of the floor level.
dance with Section 903.3.1.1 where the upper surface of Operation of makeup air openings shall be manual or
the story is not a roof assembly, a mechanical smoke automatic. The minimum gross area of makeup air
removal system in accordance with Section 910.4 shall be inlets shall be 8 square feet per 1,000 cubic feet per
installed. 2 3
minute (0.74 m per 0.4719 m /s) of smoke exhaust.
910.3 Smoke and heat vents. The design and installation of 910.4.4 Activation. The mechanical smoke removal sys-
smoke and heat vents shall be in accordance with Sections tem shall be activated by manual controls only.
910.3.1 through 910.3.3.
910.4.5 Manual control location. Manual controls shall
910.3.1 Listing and labeling. Smoke and heat vents shall be located where they are able to be accessed by the fire
be listed and labeled to indicate compliance with UL 793
service from an exterior door of the building and separated
or FM 4430.
from the remainder of the building by not less than 1-hour
910.3.2 Smoke and heat vent locations. Smoke and heat fire barriers constructed in accordance with Section 707
vents shall be located 20 feet (6096 mm) or more from of the International Building Code or horizontal assem-
adjacent lot lines and fire walls and 10 feet (3048 mm) or blies constructed in accordance with Section 711 of the
more from fire barriers. Vents shall be uniformly located International Building Code, or both.
within the roof in the areas of the building where the vents 910.4.6 Control wiring. Wiring for operation and control
are required to be installed by Section 910.2, with consid- of mechanical smoke removal systems shall be connected
eration given to roof pitch, sprinkler location and struc- ahead of the main disconnect in accordance with Section
tural members.
701.12E of NFPA 70 and be protected against interior fire
910.3.3 Smoke and heat vents area. The required aggre- exposure to temperatures in excess of 1,000°F (538°C) for
gate area of smoke and heat vents shall be calculated as a period of not less than 15 minutes.
follows:
910.4.7 Controls. Where building air-handling and
For buildings equipped throughout with an automatic mechanical smoke removal systems are combined or
sprinkler system in accordance with Section 903.3.1.1: where independent building air-handling systems are pro-
A = V/9000 (Equation 9-3) vided, fans shall automatically shut down in accordance
VR
with the International Mechanical Code. The manual con-
where:
trols provided for the smoke removal system shall have the
2
A = The required aggregate vent area (ft ).
VR capability to override the automatic shutdown of fans that
3
V = Volume (ft ) of the area that requires smoke are part of the smoke removal system.
removal. 910.5 Maintenance and testing. Maintenance and testing of
For unsprinklered buildings: smoke and heat vents and mechanical smoke removal sys-
A = A /50 (Equation 9-4) tems shall be in accordance with Sections 910.5.1 and
VR
FA
910.5.2. A written record of inspection, testing and mainte-
where:
nance that includes the date, identification of personnel
2
A = The required aggregate vent area (ft ). involved, any unsatisfactory result, corrective action taken
VR
A FA = The area of the floor in the area that requires and replaced parts shall be maintained on the premises.
smoke removal. 910.5.1 Smoke and heat vents. Smoke and heat vents
910.4 Mechanical smoke removal systems. Mechanical shall be maintained in an operative condition. Inspection,
smoke removal systems shall be designed and installed in testing and maintenance shall be in accordance with NFPA
accordance with Sections 910.4.1 through 910.4.7. 204 except as follows:
910.4.1 Automatic sprinklers required. The building 1. Mechanically operated smoke and heat vents shall
shall be equipped throughout with an approved automatic be inspected annually and operationally tested not
sprinkler system in accordance with Section 903.3.1.1. less than every 5 years.
910.4.2 Exhaust fan construction. Exhaust fans that are 2. Gravity dropout smoke and heat vents shall be
part of a mechanical smoke removal system shall be rated inspected annually.
for operation at 221°F (105°C). Exhaust fan motors shall 3. Fused, damaged or painted fusible links shall be
be located outside of the exhaust fan air stream. replaced.
910.4.3 System design criteria. The mechanical smoke 910.5.2 Mechanical smoke removal systems. Mechani-
removal system shall be sized to exhaust the building at a cal smoke removal systems shall be maintained in accor-

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