SMOKE CONTROL SYSTEMS <br />Smoke control systems (or smoke management <br />systems) are mechanical systems that control the <br />movement of smoke during a fire. Most are intend- <br />ed to protect occupants while they are evacuating <br />or being sheltered in place. The most common Sys- <br />tems referenced in current codes are atrium smoke <br />exhaust systems and stair-pressurization systems. <br />In some specialized cases, zoned smoke control <br />systems may be provided. These feature zones or <br />floors that are either pressurized or exhausted to <br />keep smoke from spreading. <br />The IBC contains mandatory provisions for <br />smoke control systems. Designers can find NFPA's <br />detailed provisions in two non-mandatory docu- <br />ments, the Recommended Practice for Smoke <br />Control Systems (NFPA 92A) and the Guide for <br />Smoke Management Systems in Malls, Atria, and <br />Large Areas (NFPA 9213). <br />The manual controls required or provided for <br />smoke control systems are a primary consideration <br />for the fire service. These manual controls can <br />override automatic controls that activate these sys- <br />tems. When fire department personnel arrive, they <br />can assess whether the automatic modes are func- <br />tioning as intended. Incident commanders may <br />then use the manual controls to select a different <br />mode or turn any given zone off. It is imperative <br />that these controls override any other manual or <br />automatic controls at any other location. <br />A simple, straightforward control panel with <br />manual switches for the smoke control system(s) <br />will assist a firefighter who may be trying to deci- <br />pher how the controls work just after awakening in <br />the middle of the night. Also, similar to annuncia- <br />tors, the fire department may have specific require- <br />ments or recommendations, and may prefer unifor- <br />mity of panels within their jurisdiction. <br />1rAip- S- IR B <br />an 4 <br />ATRIJV Stf9_IkE E:xHAOSI <br />1 <br />UAPA%C 'J-PL's <br />i- A r~.j i <br />I; <br />i <br />U ? L'UVEL <br />i <br />lj.A Hx : Xk"AJS T <br />FAN <br />a <br />B-1 L Eti' i. <br />I <br />3 I L.'LL <br />•1 <br />P <br />I <br />I• <br />(Fig. 7.4) A well-designed, <br />easy-to-understand diagram <br />of a smoke control panel. <br />Each system has a single, <br />clearly labeled switch to <br />select each mode. <br />FIRE SERVICE FEATURES OF BUILDINGS AND FIRE PROTECTION SYSTEMS 6 3 <br />179 <br />