sentences:  Employers must take all reasonable steps to ensure that control measures, and any necessary equipment of facilities, are properly used or applied (reg.8(1)).Employees must use the control measures properly, return them after use and report any defective equipment (reg.8(2)).Regulation 9 requires that employers maintain control measures in efficient working order and in good repair, with thorough examination and testing of local exhaust ventilation plant generally every 14 months, and for other controls "at suitable intervals".