To limit the probability, where provision of a minimum 2.0 m clear height may be cost-prohibitive, that an inadequate clear height of rooms or spaces [i.e. less than 1.85 m high] will lead to collision with protrusions from ceilings, such as lighting fixtures, ceiling fans and low door heads, which could lead to harm to persons.
To limit the probability, where provision of a minimum 2.0 m clear height may be cost-prohibitive, that an inadequate clear height of rooms or spaces [i.e. less than 1.85 m high] will lead to collision with protrusions from ceilings, such as lighting fixtures, ceiling fans and low door heads in an emergency, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.