It shall be prohibited to accumulate or store materials on fire
escapes or stairs, in stairways or passageways, at doors or windows
or in any other locations where in the event of fire such materials
may obstruct egress of occupants or interfere with fire-fighting operations.
Interior finish materials for acoustical correction, surface
insulation and decorative treatment on the surfaces of walls and ceilings
and interior trim shall be of materials that will not, in burning,
give off excessive amounts of smoke or objectionable gases.