Section 27-405. Ventilation of storage occupancies

Rooms or spaces used for
  the storage of flammable paints, solvents, anesthetic  agents,  fuel  or
  other oils having a flashpoint under two hundred degrees Fahrenheit (Tag
  closed  cup)  or other inflammable vaporous materials shall be vented to
  the outdoors by gravity or mechanical means, with independent supply and
  exhaust openings or ducts. If ventilation is provided by gravity  means,
  the total net free openable area of supply and exhaust openings shall be
  equal  to  at  least  one percent of the floor area of the room, equally
  divided between supply  and  exhaust.  If  ventilation  is  provided  by
  mechanical  means,  the system shall be designed to provide at least two
  air changes per hour. Where there are  explosion  hazards,  see  section
  27-401  of  this  article.  The  construction of all ventilating systems
  shall be in accordance with the requirements of subchapter  thirteen  of
  this chapter.