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C402.4.5.1 Stairway and Shaft Vents
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Stairway and shaft vents shall be provided with Class I motorized dampers with a maximum leakage rate of 4 cfm/ft2 (20.3 L/s • m2) at 1.0 inch water gauge (w.g.) (249 Pa) when tested in accordance with AMCA 500D.
Stairway and shaft vent dampers shall be installed with controls so that they are capable of automatically opening upon:
- The activation of any fire alarm initiating device of the building's fire alarm system; or
- The interruption of power to the damper.