2006 New York Code - Smoke And Heat Venting.

 
    §  27-353  Smoke  and  heat  venting.  (a)  Where  the floor area of a
  one-story building classified in occupancy  group  A,  B-1,  or  D-1  is
  greater  in  depth  than  one  hundred  feet from a frontage space, that
  portion beyond one hundred feet shall be provided with  roof  vents  and
  smoke  curtains complying with the requirements of reference standard RS
  5-11. Where the effective area of vents are glazed with plain  glass  or
  plastic not thicker than one-eighth inch, they need not be provided with
  automatic opening devices.
    (b)  Buildings  classified  in  occupancy group E, one hundred feet or
  more in height, having air-conditioning  and/or  mechanical  ventilation
  systems  that  serve  more  than  the  floor  on  which the equipment is
  located, shall be provided with at least one smoke  shaft  by  means  of
  which  smoke  and  heat  shall be mechanically vented to the outdoors as
  provided in reference standard RS 5-17. Buildings that  are  sprinklered
  throughout shall be exempt from the smoke shaft requirements.
    (c)  Existing  office  buildings,  one hundred feet or more in height,
  having air-conditioning and/or mechanical ventilation systems that serve
  more than the floor on which the equipment is located, shall be provided
  with at least one smoke shaft by means of which smoke and heat shall  be
  mechanically vented to the outdoors as provided in reference standard RS
  5-17,  or  in  lieu of such smoke shaft or shafts, all interior enclosed
  stairs other than a fire tower or access stairs may be provided  with  a
  system of pressurization for fire emergency use.
    Such  pressurization shall be provided by means of a system or systems
  as provided in reference standard RS 5-18. Such buildings  shall  comply
  with  the  smoke  and  heat  venting  requirements  herein  on or before
  September  thirteenth,  nineteeen  hundred  eighty-two.  Complete  plans
  showing  such compliance shall be filed with, and a permit secured from,
  the commissioner on or before  September  thirteenth,  nineteen  hundred
  eighty.
    Existing  buildings  that  are  sprinklered throughout shall be exempt
  from the smoke shaft and stair pressurization requirements.
    An existing building which is to be sprinklered  throughout  shall  be
  exempt  from the smoke shaft and stair pressurization requirements under
  the following conditions:
    (1)  the  installation  proceeds  in  conformance  with   a   schedule
  acceptable   to   the  commissioner,  setting  forth  the  sequence  and
  corresponding time for installation in  the  various  locations.  On  or
  before September thirteenth, nineteen hundred eighty such a schedule, as
  well  as  complete plans of the installation, shall be filed with, and a
  permit secured from, the commissioner for the phase of the  work  to  be
  done as required by paragraph two of this subdivision.
    (2)  at  least  one-third  of  the  total  floor area of the building,
  including but not limited to the entrance lobby, corridors and  elevator
  landing areas, is sprinklered on or before December thirteenth, nineteen
  hundred  eighty-one.  (3) at least two-thirds of the total floor area of
  the building is sprinklered on or before December  thirteenth,  nineteen
  hundred  eighty-two.  (4)  the  building is sprinklered throughout on or
  before  December  thirteenth,  nineteen  hundred   eighty-three.   Where
  compliance  with  the  time requirements of this subdivision would cause
  undue  hardship,  the  commissioner,  with  the  approval  of  the  fire
  commissioner,  may  extend  the  time for compliance, in accordance with
  rules and regulations to be promulgated. Before such application  for  a
  time  extension  shall be considered all required applications and plans
  must be filed and approved, permits obtained and  a  good  faith  effort
  towards completion of the work shall have been made.