Locking controls should be provided on variable frequency drives to prevent fan settings from being altered after the system has been balanced. Monitoring of power faults for all smoke control/stairwell pressurization type fans should include monitoring of service disconnects at fans (IBC 909.12.1).

3. Stair pressurization Due to the relative cost of the associated mechanical systems, and architectural space issues related to providing exterior balconies and stair vestibules, the stair pressurization system is the most widely selected design option. This course discusses the smoke control systems and examines the design

In document Stairwell Pressurization Systems (Page 50-55) 6.1. IBC Design Requirements. 1. Sections 909.5 through 909.9 of International Building Code (IBC) provide the design criteria which must be utilized when designing the Smoke Control System. These sections of the code are pertinent to the Fire Protection Engineer or Mechanical Engineer

In addition to stairs, some codes include the pressurization of elevator shafts and in smoke control techniques and early proponents of pressurization, 

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The buildings over 7 stories should be evaluated for two fans for pressurization, with one fan at the top of the stairwell and the other fan to be located near the bottom of stairwell. c. The fan shall be variable volume using a VFD and shall maintain positive static pressure in each stairwell.

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Honeywell AUTOMATIC CONTROL Manual Online: Stairwell Pressurization Control. The objective of stairwell pressurization is to provide an acceptable 

Control Diagram (VCC 909.15) . Stair Pressurization - Alternative to smoke proof enclosures (VCC 909.20.5).

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Eurotec have developed the Lift Shaft & Stairwell Pressurisation Controller, which enables control of the pressurisation fan in your stair well or lift