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Inspection and testing of engineering control equipment (hygiene tech ii)


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Jan 24, 2008
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Under Occupational Safety and Health 1994, Use and Standard exposure of Chemical Hazardous to Health Regulation 2000 (USECHH) and Factory and Machinery Act 1967, employers/owners are required (mandatory) to reduce and maintain exposure level of chemical hazard at their workplace to the lowest practicable level or below permissible exposure limits. This exercise will be monitored by the Department of Safety and Health (DOSH) to ensure employers are serious and aware of their employee’s welfare (safety to health wise).

To maintain/inspect this engineering control equipment, both Department of Safety and Health (DOSH) and National Institution of Occupational Safety and Health (NIOSH) has assigned Hygiene Technicians to conduct evaluation, inspection, examination and testing according to the guideline and submit the report/summary of the inspection (evaluation) to the employers and DOSH for further action.


1) American Conference of Governmental Industrial Hygiene (ACGIH).
2) American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).
3) Use and Standard Exposure of Chemical Hazardous to Health Regulation (USECHH).
4) Factory and Machinery Act, 1967.


Engineering Control:
Any equipment that is used to control exposure of employees to chemicals hazard to health includes:
a) Local exhaust Ventilation systems.
b) General and Dilution Ventilations.
c) Water sprayer systems.
d) Airborne particles removers.
e) Indoor Air Quality

1) Local Exhaust Ventilation system (LEV):
Equipments that contain contaminants at their source before escaping into the workroom environment consists:
1) Hood
2) Duct
3) Fitting
4) Air cleaner device( Filter)
5) Fan and motor

Testing Parameter/Technique:
1) Visual inspections.
Observation of physical condition (Leaking an etc)

2) Measurements:
a) Data Collection [Air flow, Transport Velocity, Velocity Pressure(VP), Static pressure (SP), Capture Velocity, Face Velocity, Motor and fan efficiency]
b) Calculation of the raw data to determine LEV condition and compare to the designed specification or the recommended specification. Suggested or proposed solution to clients.

2) General and Dilution Ventilation:
Consist of Supply and Return air.

Testing Parameter:
a) Number of air change / hour.
b) Final concentration.
c) Duration required to reach concentration of PEL.
d) Volumetric (actual) ventilation flow rat, visualization and distribution.
e) Air pressure.

3) Water Spray system:
Wet dust suppression system and Airborne Dust capture systems.

Consist of:
1) Reservoir
2) Filter
3) Pump
4) Fitting
5) Piping
6) Sprinkler head

Testing and inspection Parameter:
1) Physical visualization and evaluation (indication of leaking, clogging formation of dry spot, water source, water inlet / outlet, pump, valve and motor condition)
2) Calculate Lateral, elevation and fitting losses.
3) Flow-rate –flow meter (gal/min or m/sec).
4) Test of Pressure relieve.
5) Pressure distribution (Sprinkler Head).
6) Pressure across system.
a) Before filter
b) After filter
c) Main pipeline
d) Sub pipeline

Maintenance of Control Environment Devices:

Equipments under the above categories are;

a) Laminar Flow Cabinets.
b) Fume Cupboards.
c) Bio-Hazard Cabinets.
d) Clean rooms.

International Organization for Standards (ISO) has published standard test procedures (ISO 14644-2: Specification for testing and monitoring to prove continued compliance to ISO 14644-1). The objective for this direction is to test the performance of the device to ensure accurate results during experiments and safety of the operator.

Un-tested cabinets could pose the following threats;

i) Risk of contamination to the lab / product.
ii) Risk of contamination to the researcher.
iii) Inaccurate results during testing due to contamination to the specimens.
iv) Risk of skin related problems due to Ultra-violet radiations.

Schedule of Services (Control Environment Devices).

I) Performance testing will be conducted once annually over period of 1 year. Testing shall be done in accordance to ISO 14644-2 or NEBB or equivalent. Internationally Accredited Certificate shall be issued upon testing.

Testing Parameter:

 Pre-cleaning evaluation and inspection.
 HEPA Filter leakage test.
 Particle count test.
 Airflow test.
 Sound level test.
 UV intensity test.
 Light intensity test (LUX).
 Post cleaning evaluation and inspection.
 Any malfunctioning of the device shall documented and explained to the client for further actions.

Please note that the equipments used for the entire test above shall have a valid ISO 17025 certificate traceable to Department of Standards (DSM) Malaysia.

jgn memalu pm sy. kepada mereka yg memerlukan khidmat L.E.V sgt dialu-alukan. Servis boleh dilakukan diseluruh malaysia
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