Section 27-777.1. Smoke control requirements

(a) In all buildings classified
  in occupancy group C, D, E, F, G, H, J-1 or J-2:
    (1) Ventilation systems supplying different occupancy groups shall not
  be  interconnected, provided however that a ventilation system may serve
  two occupancy groups located on the same floor when  the  accessory  use
  occupies  less  than  twenty  per cent of the floor area occupied by the
  principal use.
    (2)   Ventilation   systems   supplying   corridors   shall   not   be
  interconnected  with  systems  serving  other  spaces,  except that this
  requirement shall not apply to floors used exclusively as  office  space
  in   buildings   classified   in  occupancy  group  E  which  are  fully
  sprinklered.
    (3) A ventilation system supplying any part of a means of egress shall
  not be interconnected with any other ventilation system.
    (4) A ventilation system supplying public areas  and  assembly  spaces
  shall  have  smoke detecting devices that will shut down the system upon
  detecting smoke.
    (5) In  buildings  classified  in  occupancy  group  J-2,  ventilation
  systems  supplying individual apartments shall not be directly connected
  with any other ventilation system.
    (6) Except in buildings classified in  occupancy  group  J-2,  and  as
  otherwise  provided in section 27-343 of article five of subchapter five
  of this chapter, either a combined heat and smoke damper or  independent
  heat  and  smoke  dampers  shall  be  installed  at  any  penetration of
  construction required to have a fire-resistance rating.
    (b) In all buildings classified in occupancy group C, D, E, F, G, H or
  J-1, there shall be provided a system of mechanical means of  sufficient
  capacity to exhaust six air changes per hour or 1 cfm/sq. ft., whichever
  is  greater,  from  the  largest  floor  in  the  building, using either
  dedicated fan equipment or the building ventilation system  arranged  to
  shut  down  automatically with manual override capability to exhaust one
  floor at a time through a roof or an approved location  on  an  exterior
  wall other than a lot line wall.