An LEV test report should be read as an engineering document rather than as a certificate whose conclusion can be accepted without examining its supporting information. The central questions are what was measured, where each measurement was taken, which design or operating benchmark was used, and what the recorded result means for the system's ability to perform as intended. UAE sources identify several relevant technical checks, but no authority located prescribes a general LEV report format, universal report content or a general pass-or-fail threshold. The boundaries of this engineering-plant resource are distinct from the respirable crystalline silica site, the industrial hygiene site carrying a page on ventilation and LEV assessment from the occupational hygiene angle, the VOC and indoor chemicals site covering adhesives, sealants and solvents, and the construction dust site. Personal exposure monitoring, health effects and airborne contaminant sampling fall outside this site, while kitchen extract cleaning belongs to the separate duct hygiene resource.
A report should first make clear which system was examined. LEV plant may contain several hoods, branch ducts, dampers, an air cleaner, a fan, a discharge arrangement, make-up air provisions and warning devices. A result assigned only to a room or production area may be too vague to show which component or branch was tested. UAE sources do not prescribe an asset-numbering system, but meaningful interpretation depends on connecting each finding to identifiable plant.
The report's purpose also affects its meaning. A commissioning test, periodic performance test, fault investigation and post-repair verification may examine similar components but answer different questions. No UAE authority located provides mandatory titles for these report types. Consequently, the scope should be understood from the work recorded, the stated benchmark and the conclusion rather than from a title alone.
The date of the work, operating condition and status of the process are also material. Airflow readings obtained while some branches are closed, filters are absent, access panels are open or the process is not in its normal configuration may not represent ordinary operation. The UAE sources supplied do not prescribe a universal reporting statement for operating condition, so any absence of such information should be recognised as a limitation rather than silently assumed away.
Sharjah Guideline OSHJ-GL-12 Local Exhaust Ventilation, Version 1 Rev 0, September 2021, was issued by the Sharjah Prevention and Safety Authority under the Occupational Safety and Health System in Sharjah and sets minimum acceptable requirements. Section 5.6.2.2 provides the closest identified UAE source to a content specification for technical examination, although it does not prescribe a report layout.
The section states: "The entity should measure the technical performance of the LEV system, including but not limited to: Measuring the air velocities at suitable test points indicated in the system documentation and includes hood faces, branch ducts and the main duct; Measuring static pressure at suitable test points indicated in the system documentation and includes all hoods, ducting, across the air cleaner and fan; Checking the fan speed, motor speed and electrical power consumption; Checking the replacement or make-up air supply; Testing alarms by simulating a failure, and the alarm's ability to detect the failure; Measuring air temperatures; Testing the air cleaner performance."
The list covers more than a single velocity reading at a hood. It addresses the pressure behaviour of the system, mechanical and electrical operation of the fan and motor, replacement air, alarm response, temperature and air-cleaner performance. A report containing only one unlocated air velocity cannot demonstrate that all those matters were considered. The Guideline uses "including but not limited to", so the listed checks are not presented as an exhaustive ceiling.
The Sharjah wording repeatedly refers to suitable test points indicated in the system documentation. That creates an important reading test: a measurement value should be connected to a recognisable point. "Hood velocity" without identification of the hood, position or documented test point may not be capable of comparison with the system's original information.
Static-pressure results require similar traceability. A pressure recorded before an air cleaner has a different engineering meaning from a pressure recorded after it, across it or near the fan. The Sharjah provision refers to measurements at suitable test points including all hoods, ducting, across the air cleaner and fan. The report should therefore permit the location and role of each pressure result to be understood, even though the Guideline does not prescribe a table design or drawing convention.
The source does not state a universal averaging period, sampling duration or instrument method for these measurements. No such condition should be invented. A report may state a method or stabilisation procedure derived from system documentation, manufacturer information or another identified standard, but that basis should be distinguished from the content expressly stated in Sharjah OSHJ-GL-12.
A result becomes meaningful only when it is compared with an appropriate benchmark. Sharjah OSHJ-GL-12 says that the examiner should calculate volume flow rates and includes the instruction: "Comparing the results of testing with the LEV design specification as identified in the system manufacturer's manual".
This wording places the system's design specification and manufacturer's manual at the centre of interpretation. A measured velocity or pressure is not automatically satisfactory merely because it appears plausible. Its significance depends on whether it matches the documented performance intended for that hood, branch, duct, air cleaner or fan.
No UAE authority located prescribes a general pass-or-fail criterion for LEV systems as a whole. There is no identified UAE-wide percentage tolerance, universal capture-velocity table, maximum pressure-loss figure or standard wording that converts every set of readings into a pass or failure. A report should therefore disclose the benchmark actually used. A conclusion unsupported by a design value, manufacturer requirement or other expressly identified basis is difficult to audit as an engineering decision.
Sharjah OSHJ-GL-12 Section 5.6.2.2 states: "If a defect is fundamental or obscure, the examination should stop until the system has been repaired and its original performance restored".
This instruction affects both the conduct of the work and the reading of the final document. A report that identifies a fundamental or obscure defect but continues to issue an unqualified pass has not followed the Sharjah rule. The defect prevents the examination from establishing restored original performance, so the report should not present an unsupported satisfactory conclusion.
The Guideline does not define every condition that amounts to a fundamental or obscure defect. Interpretation therefore depends on the engineering circumstances and the examiner's stated reasoning. A missing fan, collapsed duct or inaccessible system may be readily understood, while an unstable pressure pattern or unexplained branch behaviour may require further investigation. The report should explain why the examination stopped, what must be repaired and what remains to be confirmed.
No UAE authority located sets a general competence, registration or accreditation requirement for all LEV testers. ADPHC Code of Practice CoP 52.0 Local Exhaust Ventilation, Version 4.1, dated 27 February 2026, issued by the Abu Dhabi Public Health Centre under ADOSH-SF and mandatory for employers in the Emirate of Abu Dhabi, uses the term "competent person" exactly twice. It does not define that term, prescribe a qualification, establish a register or name a general accreditation scheme for LEV testing.
That silence does not make competence irrelevant. It means that a report cannot be accepted as compliant merely because its author uses a particular job title, nor rejected solely because no UAE-wide LEV tester registration number appears. Evidence of competence may instead be considered through training, experience, knowledge of the system, measurement capability and the quality of the engineering reasoning, but ADPHC CoP 52.0 does not prescribe those evidential categories.
The absence of a general approval scheme should also prevent the fume-hood rule from being extended beyond its stated scope. Requirements attached specifically to fume hoods and laboratory hoods do not become general requirements for welding extract arms, enclosed booths, production-machine enclosures or other LEV plant.
ADPHC CoP 52.0 contains a specific exception for fume hoods and laboratory hoods. Section 3.4(f)(i) states: "hoods shall have their performance tested and certified on an annual basis (Emirates Authority for Standardization and Metrology approved third party entity)". Annual is a certification interval rather than a measured quantity and therefore carries no averaging period or sampling basis.
Section 3.4(f)(ii) states: "hood testing shall be based on manufacture recommendations, applicable international standards, and international best practices". Section 3.4(f)(iii) states: "a competent person shall be responsible for performing the annual testing and certification of hoods". Section 3.4(f)(iv) states: "all identified deficiencies shall be reported and corrected. Hoods found unable to provide appropriate airflow or leaking contaminants shall be taken out of service until repairs are made".
These provisions create a defined testing and certification regime for the hoods covered by Section 3.4(f). The Emirates Authority for Standardization and Metrology approved third-party requirement applies to fume hoods and laboratory hoods only. It does not extend to LEV generally, and a report for other LEV plant should not claim that such approval is universally mandated by ADPHC CoP 52.0.
Sharjah OSHJ-GL-12 is a Sharjah Prevention and Safety Authority Guideline setting minimum acceptable requirements in the Emirate of Sharjah. ADPHC Codes of Practice are mandatory for employers in the Emirate of Abu Dhabi.
Sharjah OSHJ-GL-12 Sections 5.6.2 and 5.6.2.2; ADPHC CoP 52.0 Sections 3.4(f)(i) and 3.4(f)(ii).
Answer: Sharjah Guideline OSHJ-GL-12 Local Exhaust Ventilation, Version 1 Rev 0, September 2021, was issued by the Sharjah Prevention and Safety Authority under the Occupational Safety and Health System in Sharjah and sets minimum acceptable requirements. Section 5.6.2.2 identifies measurements and checks including velocities, static pressures, fan and motor operation, electrical power consumption, make-up air, alarms, temperatures and air-cleaner performance. The report should show what was measured, where it was measured and how the result was compared with the design specification identified in the manufacturer's manual. No UAE authority located prescribes a universal LEV report format.
Answer: No UAE authority located prescribes a general pass-or-fail criterion for LEV systems. Sharjah Guideline OSHJ-GL-12, issued by the Sharjah Prevention and Safety Authority under the Occupational Safety and Health System in Sharjah and setting minimum acceptable requirements, calls for results to be compared with the LEV design specification identified in the system manufacturer's manual. It also states that an examination should stop when a defect is fundamental or obscure until repair and restoration of original performance. A pass conclusion should therefore be supported by traceable measurements, an identified benchmark and the absence of an unresolved defect that required the examination to stop.
Answer: No UAE authority located establishes a general registration, qualification or third-party approval requirement for LEV testers generally. ADPHC Code of Practice CoP 52.0 Local Exhaust Ventilation, Version 4.1, dated 27 February 2026, issued by the Abu Dhabi Public Health Centre under ADOSH-SF and mandatory for employers in the Emirate of Abu Dhabi, does not define "competent person" or create a general LEV tester register. The specific Emirates Authority for Standardization and Metrology approved third-party requirement in Section 3.4(f)(i) applies to the annual testing and certification of fume hoods and laboratory hoods. It must not be extended to all LEV systems.
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