An employer must ensure-
(a) that any workplace or part thereof under his or her control, where the concentration of an HCA in the air is or may be such that the exposure of an employee working in that workplace exceeds the restricted limit without the wearing of respiratory protective equipment, is zoned as a respirator zone;
(b) that a respirator zone is clearly demarcated and identified by a notice indicating that the relevant area is a Regulations for hazardous chemical agents, respirator zone and that personal protective equipment as contemplated in regulation 11 must be worn there; and
(c) that no person enters or remains in a permanent respirator zone unless he or she is wearing the required
personal protective equipment.