LEV System

Our Services: Design, Installation, Inspection, Testing & Examination of Local Exhaust Ventilation (LEV)


  • Guidelines on Design, Operation and Maintenance of Local Exhaust Ventilation System published by Occupational Safety and Health Specialist Department OSH Division Ministry of Manpower (MOM), Singapore, 2006
  • Guidelines for Design, Inspection, Testing and Examination of Local Exhaust Ventilation System published by Department Occupational Safety and Health (DOSH), Ministry of Human Resources Malaysia, 2005
  • Controlling air borne contaminants at work – A guide to local exhaust ventilation (LEV), HSE, UK, 2011
  • A Manual of Recommended Practice for Operation and Maintenance ACGIH, 26th Edition, 2007

LEV Main Components

LEV Regulations

Singapore: Workplace Safety and Health (General Provisions) Regulations 5 & 39

Regulation 5(2) stipulates that where gases, vapours or other impurities are generated in the course of any process or work carried out in a workplace which may be injurious to health, effective and suitable ventilation shall be provided for securing and maintaining the circulation of fresh air in the workplace, to render harmless so far as is practicable, all such gases, vapours or other impurities.

Regulation 39(1) stipulates that where any process or work carried on in any workplace is likely to produce or give off any toxic, irritating or offensive dust, fume or other contaminants, all practicable measures shall be taken to protect persons employed in the workplace against inhalation of the dust, fume or other contaminants; and prevent their accumulation in the workplace.

Regulation 39(2) – the measures to be taken shall, where appropriate, include providing local exhaust ventilation to remove the dust, fumes or other contaminants at their sources of emission. The measure shall, where appropriate, include: (a) Isolation; (b) Closed System; (c) local exhaust ventilation; (d) dilution ventilation ; (e)wetting

Regulation 39(3) -local exhaust ventilation system shall be so designed, constructed, operated and maintained that dust, fume or other contaminants are safely and effectively removed at the source of generation and not dispersed or scattered in the surrounding air.

Malaysia: Occupational Safety and Health (Use and Standard Exposure to Chemicals Hazardous to Health) Regulations 2000(Regulation 17, 18, 19)

Regulation 17 stipulated that any engineering control equipment has to be inspected at an interval not longer than one month and has to be examined and tested by Hygiene Technician at an interval not longer than twelve months.

Regulation 18 stipulated that local exhaust ventilation system has to design according to approved standard by registered professional engineer. This regulation also stipulated the responsibility of registered professional engineer to test the local exhaust ventilation system after construction and installation.

Regulation 19 stipulated the type of records the employer has to keep and produced for inspection when requested by Director General of Occupational Safety and Health.

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