Section 27-346. Partitions and furring

In buildings of construction group I,
  partitions and furring shall be constructed of noncombustible materials,
  except  that  nonbearing  partitions  that  are  not  required to have a
  fire-resistance rating, and furring may be constructed of fire retardant
  treated wood as provided in subdivision (d) of section 27-328 of article
  three of this subchapter, and except that such partitions  and  furring,
  may  be  constructed  of  combustible  materials in spaces classified in
  occupancy group E, J-2, or J-3, provided the  following  conditions  are
  met:
    (a)  the  space  containing the combustible partitions does not exceed
  five thousand square feet in  area  within  a  noncombustible  enclosure
  having a fire-resistance rating of at least one hour.
    (b) the space is in a single tenancy.
    (c) glass or slow burning plastic is used for glazing.