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Where approved by the fire code official, engineered mechanical smoke exhaust shall be an acceptable alternate to smoke and heat vents.
[F] 910.4.1 Location
Exhaust fans shall be uniformly spaced within each draft-curtained area and the maximum distance between fans shall not be greater than 100 feet (30 480 mm).
[F] 910.4.2 Size
Fans shall have a maximum individual capacity of 30,000 cfm (14.2 m3/s). The aggregate capacity of smoke exhaust fans shall be determined by the equation:
C = A × 300(Equation 9-4)
where:
C= Capacity of mechanical ventilation required, in
cubic feet per minute (m3/s).
A=Area of roof vents provided in square feet (m2) in
accordance with Table 910.3.
[F] 910.4.3 Operation
Mechanical smoke exhaust fans shall be automatically activated by the automatic sprinkler system or by heat detectors having operating characteristics equivalent to those described in Section 910.3.2. Individual manual controls of each fan unit shall also be provided.
[F] 910.4.4 Wiring and Control
Wiring for operation and control of smoke exhaust fans shall be connected ahead of the main disconnect and protected against exposure to temperatures in excess of 1,000°F (538°C) for a period of not less than 15 minutes. Controls shall be located so as to be immediately accessible to the fire service from the exterior of the building and protected against interior fire exposure 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] 910.4.5 Supply Air
Supply air for exhaust fans shall be provided at or near the floor level and shall be sized to provide a minimum of 50 percent of required exhaust. Openings for supply air shall be uniformly distributed around the periphery of the area served.
[F] 910.4.6 Interlocks
In combination comfort air-handling/smoke removal systems or independent comfort air-handling systems, fans shall be controlled to shut down in accordance with the approved smoke control sequence.

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910.4 Fire Protection Systems, Mechanical Smoke Exhaust
Where approved by the fire code official, engineered mechanical smoke exhaust shall be an acceptable alternative to smoke and heat vents ...
910.4 Fire Protection Systems, Mechanical Smoke Exhaust
Where approved by the fire code official, engineered mechanical smoke exhaust shall be an acceptable alternate to smoke and heat vents ...
910.4.2 Fire Protection Systems, Size
Fans shall have a maximum individual capacity of 30,000 cfm (14.2 m3/s). The aggregate capacity of smoke exhaust fans shall be determined ...
910.4.3 Fire Protection Systems, Operation
Mechanical smoke exhaust fans shall be automatically activated by the automatic sprinkler system or by heat detectors having operating ...
910.4.3 Fire Protection Systems, Operation
Mechanical smoke exhaust fans shall be automatically activated by the automatic sprinkler system or by heat detectors having operating ...