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Published by American Conference of Governmental Industrial Hygienists (ACGIH)
Used by engineers, regulators and industrial hygienists
Used to to design and evaluate industrial ventilation systems
No specific standard for designing of local exhaust ventilation system
Design Standard followed American Conference of Governmental Industrial Hygienists (ACGIH)
Designer has to submit standard to be used for approval by Director General of Occupational Safety and Health before proceed with design.
Director General
Director General will evaluate the design standard of the local exhaust ventilation system.
Every LEVS should be inspected, tested and examined at regular interval to ensure system works properly and efficiently.
New installed system should be thoroughly tested and examined to ensure design specifications are met and airflow through each of the hood is sufficient to extract contaminant effectively
Purpose of inspection: ensure system functioning properly and efficiently
Inspection of LEVS consists of:
Smoke Tube Tracer Test
Inspection has to be done at least once a month or at shorted interval as specified by the designer.
Inspection can be done by any person that has been taught the procedure to carry out the inspection.
Purpose of testing and examination: to determine the effectiveness and efficiency of the LEVS and to detect malfunction of the system.
T & E of LEVS consists of:
Testing and Examination (T&E) of LEVS has to be carried out at least every 12 months or at shorter interval as specified by the designer.
T&E need to be done during commissioning of a new installed LEVS as to verify that the system is working as per design.
Act as a baseline data that will be used for comparison when subsequent T&E to be carried out.
Determination of capture of face velocity
Determination of duct velocity and temperature