Horizontal sliding or vertical security grilles or doors that are a part of a required means of egress shall conform to the following:
- They shall remain in the full open position during the period of occupancy by the general public.
- Doors or grilles shall not be brought to the closed position when there are 10 or more persons occupying spaces served by a single exit or 50 or more persons occupying spaces served by more than one exit.
- The doors or grilles shall be openable from within without the use of any special knowledge or effort where the space is occupied.
- Where two or more exits are required, not more than one-half of the exits shall be permitted to include either a horizontal sliding or vertical rolling grille or door.