Page 172 - 2018_IFC

FIRE PROTECTION AND LIFE SAFETY SYSTEMS

3. The pressure differential is permitted to be mea- ent, each shall be independently capable of activating the
sured relative to the outdoor atmosphere on floors pressurization system.
other than the following: [BF] 909.21.7 Testing. Testing for performance shall be
3.1. The fire floor. required in accordance with Section 909.18.8. System
acceptance shall be in accordance with Section 909.19.
3.2. The two floors immediately below the fire
floor. [BF] 909.21.8 Marking and identification. Detection
and control systems shall be marked in accordance with
3.3. The floor immediately above the fire floor.
Section 909.14.
4. The minimum positive pressure of 0.10 inch of [BF] 909.21.9 Control diagrams. Control diagrams shall
water (25 Pa) and a maximum positive pressure be provided in accordance with Section 909.15.
of 0.25 inch of water (67 Pa) with respect to
occupied floors is not required at the floor of [BF] 909.21.10 Control panel. A control panel comply-
recall with the doors open. ing with Section 909.16 shall be provided.
[BF] 909.21.1.1 Use of ventilation systems. Ventila- [BF] 909.21.11 System response time. Hoistway pressur-
tion systems, other than hoistway supply air systems, ization systems shall comply with the requirements for
are permitted to be used to exhaust air from adjacent smoke control system response time in Section 909.17.
spaces on the fire floor, two floors immediately below
and one floor immediately above the fire floor to the SECTION 910
building’s exterior where necessary to maintain posi- SMOKE AND HEAT REMOVAL
tive pressure relationships as required in Section
909.21.1 during operation of the elevator shaft pressur- 910.1 General. Where required by this code, smoke and heat
vents or mechanical smoke removal systems shall conform to
ization system.
the requirements of this section.
[BF] 909.21.2 Rational analysis. A rational analysis com-
plying with Section 909.4 shall be submitted with the con- 910.2 Where required. Smoke and heat vents or a mechani-
cal smoke removal system shall be installed as required by
struction documents.
Sections 910.2.1 and 910.2.2.
[BF] 909.21.3 Ducts for system. Any duct system that is
part of the pressurization system shall be protected with Exceptions:
the same fire-resistance rating as required for the elevator 1. Frozen food warehouses used solely for storage of
shaft enclosure. Class I and II commodities where protected by an
[BF] 909.21.4 Fan system. The fan system provided for approved automatic sprinkler system.
the pressurization system shall be as required by Sections 2. Smoke and heat removal shall not be required in
909.21.4.1 through 909.21.4.4. areas of buildings equipped with early suppression
[BF] 909.21.4.1 Fire resistance. Where located within fast-response (ESFR) sprinklers.
the building, the fan system that provides the pressur- 3. Smoke and heat removal shall not be required in
ization shall be protected with the same fire-resistance areas of buildings equipped with control mode spe-
rating required for the elevator shaft enclosure. cial application sprinklers with a response time
1/2
index of 50 (m · s) or less that are listed to control
[BF] 909.21.4.2 Smoke detection. The fan system
a fire in stored commodities with 12 or fewer sprin-
shall be equipped with a smoke detector that will auto-
matically shut down the fan system when smoke is klers.
detected within the system. 910.2.1 Group F-1 or S-1. Smoke and heat vents installed
in accordance with Section 910.3 or a mechanical smoke
[BF] 909.21.4.3 Separate systems. A separate fan sys-
tem shall be used for each elevator hoistway. removal system installed in accordance with Section 910.4
shall be installed in buildings and portions thereof used as
[BF] 909.21.4.4 Fan capacity. The supply fan shall be
a Group F-1 or S-1 occupancy having more than 50,000
either adjustable with a capacity of not less than 1,000 square feet (4645 m ) of undivided area. In occupied por-
2
3
cfm (0.4719 m /s) per door, or that specified by a regis-
tions of a building equipped throughout with an automatic
tered design professional to meet the requirements of a sprinkler system in accordance with Section 903.3.1.1,
designed pressurization system.
where the upper surface of the story is not a roof assembly,
[BF] 909.21.5 Standby power. The pressurization system a mechanical smoke removal system in accordance with
shall be provided with standby power in accordance with Section 910.4 shall be installed.
Section 1203.
Exception: Group S-1 aircraft repair hangars.
[BF] 909.21.6 Activation of pressurization system. The 910.2.2 High-piled combustible storage. Smoke and heat
elevator pressurization system shall be activated upon acti- removal required by Table 3206.2 for buildings and por-
vation of either the building fire alarm system or the eleva- tions thereof containing high-piled combustible storage
tor lobby smoke detectors. Where both a building fire
shall be installed in accordance with Section 910.3 in
alarm system and elevator lobby smoke detectors are pres-
unsprinklered buildings. In buildings and portions thereof

2018 INTERNATIONAL FIRE CODE ® 139
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