The ceiling of an exit route must be at least seven feet six inches (2.3 m) high. Any projection from the ceiling must not reach a point less than six feet eight inches (2.0 m) from the floor.
An exit access must be at least 28 inches (71.1 cm) wide at all points. Where there is only one exit access leading to an exit or exit discharge, the width of the exit and exit discharge must be at least equal to the width of the exit access.
The width of an exit route must be sufficient to accommodate the maximum permitted occupant load of each floor served by the exit route.
Objects that project into the exit route must not reduce the width of the exit route to less than the minimum width requirements for exit routes.