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// CODE SNIPPET

[F] 910.4 Mechanical Smoke Removal Systems

Building Code 2018 of Illinois > 9 Fire Protection and Life Safety Systems > 910 Smoke and Heat Removal > 910.4 Mechanical Smoke Removal Systems
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Mechanical smoke removal systems shall be designed and installed in accordance with Sections 910.4.1 through 910.4.7.

910.4.1 Automatic Sprinklers Required

The building shall be equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1.

910.4.2 Exhaust Fan Construction

Exhaust fans that are part of a mechanical smoke removal system shall be rated for operation at 221°F (105°C). Exhaust fan motors shall be located outside of the exhaust fan air stream.

910.4.3 System Design Criteria

The mechanical smoke removal system shall be sized to exhaust the building at a minimum rate of two air changes per hour based on the volume of the building or portion thereof without contents. The capacity of each exhaust fan shall not exceed 30,000 cubic feet per minute (14.2 m3/s).

910.4.3.1 Makeup Air

Makeup air openings shall be provided within 6 feet (1829 mm) of the floor level. Operation of makeup air openings shall be manual or automatic. The minimum gross area of makeup air inlets shall be 8 square feet per 1,000 cubic feet per minute (0.74 m2 per 0.4719 m3/s) of smoke exhaust.

910.4.4 Activation

The mechanical smoke removal system shall be activated by manual controls only.

910.4.5 Manual Control Location

Manual controls shall be located where they are able to be accessed by the fire service from an exterior door of the building and separated from the remainder 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 711, or both.

[F] 910.4.6 Control Wiring

Wiring for operation and control of mechanical smoke removal systems shall be connected ahead of the main disconnect in accordance with Section 701.12E of NFPA 70 and be protected against interior fire exposure to temperatures in excess of 1,000°F (538°C) for a period of not less than 15 minutes.

[F] 910.4.7 Controls

Where building air-handling and mechanical smoke removal systems are combined or where independent building air-handling systems are provided, fans shall automatically shut down in accordance with the International Mechanical Code. The manual controls provided for the smoke removal system shall have the capability to override the automatic shutdown of fans that are part of the smoke removal system.

Related Code Sections


910.4 Fire Protection and Life Safety Systems, Mechanical Smoke Removal Systems
Mechanical smoke removal systems shall be designed and installed in accordance with Sections 910.4.1 through 910.4.7 ...
Building Code 2021 of Illinois > 9 Fire Protection and Life Safety Systems > 910 Smoke and Heat Removal > 910.4 Mechanical Smoke Removal Systems
910.4 Fire Protection and Life Safety Systems, Mechanical Smoke Removal Systems
Mechanical smoke removal systems shall be designed and installed in accordance with Sections 910.4.1 through 910.4.7 ...
Building Code 2018 of Illinois > 9 Fire Protection and Life Safety Systems > 910 Smoke and Heat Removal > 910.4 Mechanical Smoke Removal Systems
910.4.2 Fire Protection and Life Safety Systems, Exhaust Fan Construction
Exhaust fans that are part of a mechanical smoke removal system shall be rated for operation at 221°F (105°C). Exhaust fan motors shall be located ...
Building Code 2018 of Illinois > 9 Fire Protection and Life Safety Systems > 910 Smoke and Heat Removal > 910.4 Mechanical Smoke Removal Systems > 910.4.2 Exhaust Fan Construction
910.4.3 Fire Protection and Life Safety Systems, System Design Criteria
The mechanical smoke removal system shall be sized to exhaust the building at a minimum rate of two air changes per hour based on the volume ...
Building Code 2021 of Illinois > 9 Fire Protection and Life Safety Systems > 910 Smoke and Heat Removal > 910.4 Mechanical Smoke Removal Systems > 910.4.3 System Design Criteria
910.4.3 Fire Protection and Life Safety Systems, System Design Criteria
The mechanical smoke removal system shall be sized to exhaust the building at a minimum rate of two air changes per hour based on the volume ...
Building Code 2018 of Illinois > 9 Fire Protection and Life Safety Systems > 910 Smoke and Heat Removal > 910.4 Mechanical Smoke Removal Systems > 910.4.3 System Design Criteria
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