Section 27-431. Separation of direct-fired dryers

In moderate hazard dry
  cleaning establishments, direct-fired dryers shall not be used.  In  low
  hazard  dry  cleaning  establishments  using nonflammable solvents only,
  direct fired dryers may be used, but such dryers shall  not  be  located
  within  twenty-five  feet of a dry cleaning unit unless a noncombustible
  partition (which may be glazed), equipped with  self-closing  doors,  is
  provided  between  the dry cleaning unit and the flame producing device.
  This partition  may  provide  either  complete  or  partial  separation,
  provided  that any partial separation shall be so arranged that the line
  of air travel around the partition from the cleaning units to the  dryer
  is a minimum of twenty-five feet. Where a solid noncombustible partition
  is  constructed  extending  to  the  ceiling  and  all  portions  of the
  enclosure are solid, except for self-closing access doors,  and  outdoor
  air for combustion and drying is supplied, the separation may be reduced
  to fifteen feet.