Where respiratory protective equipment is provided, the employer must ensure-
(a) that the relevant equipment is capable of controlling the exposure to below the OEL for the relevant HCA;
(b) that the relevant equipment is correctly selected and properly used;
(c) that information, instructions, training and supervision, which is necessary with regard to the use of the equipment, is known to the employee; and
(d) that the equipment is kept in good condition and efficient working order.