If a smoke alarm cannot be installed on or near the ceiling because –

(a) the structure of the part of the premises in which the smoke alarm is to be installed does not permit the smoke alarm to be placed on or near the ceiling of the part of the premises; or

(b) the placement of the smoke alarm on the ceiling is likely to result in the smoke alarm emitting a warning of the presence of smoke in circumstances where the smoke does not emanate from a fire that is unattended by a person; or

(c) in the case of a cathedral ceiling, a dead air space will trap air and thereby prevent smoke from reaching a smoke alarm –

the smoke alarm may be installed on an interior side wall if –

(d) the smoke alarm is suitable for such application; and

(e) the top of the smoke alarm is located between 300mm and 500mm from the ceiling; and

(f) in the case of a cathedral ceiling, the distance from the apex of the cathedral ceiling to the top of the smoke alarm is between 500mm and 1 500mm.