Section 27-391. Signs at elevator landings

A  sign shall be posted and
  maintained on every floor at the elevator landing. The sign  shall  read
  "IN CASE OF FIRE, USE STAIRS UNLESS OTHERWISE INSTRUCTED". The lettering
  shall  be  at  least  one-half  inch  block  letters  in  red with white
  background or as otherwise approved by the commissioner. Such  lettering
  shall be properly spaced to provide good legibility. The sign shall also
  contain  a  diagram  showing  the  location  where  it is posted and the
  location and letter identification of the stairs on the floor. The  sign
  shall  be at least ten inches by twelve inches, located directly above a
  call button and securely attached to the wall or partition. The  top  of
  such  sign shall not be above six feet from the floor level. The diagram
  on such sign may be omitted provided that signs containing such  diagram
  are  posted in conspicuous places on the respective floor. In such case,
  the sign at the elevator landing shall be at  least  two  and  one  half
  inches  by  ten  inches  and  the  diagram signs shall be at least eight
  inches by twelve inches.