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 92B). <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 />STWI F''RL` WRiiZATION <br />"TAIR A <br />STAIR B <br />-T, 6, <br />f~t~~R ~r+y+~??yb~ ~~1N'ff~~L <br />(3WHAGE SUPPL GARAGE =~}fhlAUSi <br />- FNS <br />-M S <br />yet '8 <br />0 <br />I@. n•r ;y <br />. <br />w ✓4 <br />F- I LF'W L <br />B- I! LEVEL <br />pia.: Lb <br />02 LEVEL. <br />$ i a <br />Br? L0 IL VEL <br />:PlJi'I Y~Gc'4 <br />rnr s+ <br />An" t s_: ! <br />~ 74tr' <br />K 7[.h <br />LL. <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 />• <br />FIRE S,ER.VICE FEATURES OF B•U.ILD, . INGS AND FIRE PROTECTION SYSTEMS 63 <br />179 <br />