Laboratory fume cupboards and laboratory hoods receive the most detailed treatment of any LEV form in the located UAE material. 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, addresses room arrangement, air recirculation, make-up air, pressure relationships, variable air volume systems, hood velocity, testing, discharge stacks, airflow indicators and operating practices. The four sibling resources cover respirable crystalline silica, industrial hygiene including ventilation and LEV assessment from the occupational hygiene angle, VOCs and indoor chemicals including adhesives, sealants and solvents, and construction dust, while this page is confined to laboratory fume cupboards as specified, installed, tested and maintained engineering plant.
ADPHC CoP 52.0 Section 3.4(a) states that there must be no recirculation of air to the laboratory or to any other spaces. Extracted laboratory air is therefore not to be returned to the room from which it originated or transferred into another occupied space. The provision is categorical in the supplied material and is not expressed as depending on a particular chemical, filter class or operating period.
Hoods must be positioned so that persons entering or leaving the laboratory do not pass in front of the hood. Movement through the hood face area may interfere with the intended airflow and places a circulation route immediately beside an active work opening. The Code deals with this issue through room planning rather than leaving it solely to operating instructions after installation.
Section 3.4(a) also requires a minimum of two exits from the room, or the hood must be located on the side farthest from the door. The minimum of two exits is a count relating to room configuration rather than a measured airflow quantity. Where that room arrangement is not provided, the alternative is a hood position farthest from the door.
Hoods must not be placed directly opposite occupied workstations, and windows in laboratories containing hoods "shall be fixed closed". These requirements reduce conflicts between hood operation, room openings and regularly occupied positions. The supplied Code does not state a permitted separation distance from an occupied workstation and does not provide an alternative opening arrangement for the fixed-window requirement.
Section 3.4(a) requires HVAC in laboratory areas to be designed to close automatically or, as a minimum, to have dampers capable of local control to avoid ingress of toxic materials into HVAC systems. This is the single appearance of the word "damper" in ADPHC CoP 52.0. It concerns protection of the laboratory HVAC system from toxic-material ingress and is not a provision about balancing LEV branches.
Before a new fume hood or laboratory hood is placed into operation, Section 3.4(b) states that "a survey shall be conducted to ensure there is appropriate make-up air". The Code does not provide a single make-up-air quantity in this sentence. The survey must therefore address the installed room and hood arrangement rather than relying on an unsupported universal value attributed to the Code.
Supply and exhaust volumes must be arranged so that the laboratory remains under slightly negative pressure, even when the hoods are not operating. The source uses the qualitative expression "slightly negative pressure" and supplies no numerical pressure value, measurement duration or sampling basis. No numerical pressure criterion should therefore be presented as though it were stated in ADPHC CoP 52.0.
Supply-air diffusers must be directed so that incoming air does not affect airflow at the hood. A room may receive sufficient replacement air overall while a poorly positioned diffuser disturbs the hood opening. Section 3.4(b) consequently addresses both air quantity and the direction from which that air enters the working space.
The supply-air intake must be "a minimum of 15 meters from any fume hood or laboratory hood exhaust". Fifteen metres is a separation distance and not a measured concentration, velocity or pressure quantity. It must not be assigned an averaging period or sampling basis.
This separation protects the relationship between discharged laboratory air and incoming building air. The requirement applies to the distance between the supply intake and any fume-hood or laboratory-hood exhaust. The Code wording does not provide an alternative reduced distance based on filtration, discharge velocity or stack arrangement.
Hood exhaust stacks must be "at least two meters above the roof and one meter above any parapet walls, whichever is greater". Two metres and one metre are discharge-stack heights and not measured airflow quantities. The higher applicable discharge position governs where the roof and parapet arrangements differ.
Stacks must also be "a minimum of 15 meters and preferable downwind from any air intakes". Fifteen metres is a distance and not a measured quantity. The wording establishes the minimum separation and expresses a preference for a downwind location. It does not supply a wind-speed criterion, wind-direction observation period or calculation method.
Section 3.4(d) states that rain caps and similar devices are not allowed where they divert exhaust towards the roof. The provision concerns discharge direction rather than weather protection in the abstract. A device that turns the exhaust back towards the roof is inconsistent with the stated requirement even where the stack otherwise meets the listed heights and separation distance.
Section 3.4(c) requires variable air volume systems to be designed by a competent engineer with variable air volume experience. The competence requirement is specific to the system type and recognises that airflow must respond appropriately as operating conditions change. The source does not define a particular qualification, licence or number of years of experience in the supplied wording.
"VAV systems shall maintain a minimum air velocity of 18 meters/min during periods of non-use." The minimum velocity is 18 metres per minute, and the stated measurement condition is during periods of non-use. That condition must remain attached to the value because it distinguishes the non-use requirement from the in-use hood velocity specified elsewhere in Section 3.4.
Existing LEV systems must not be converted to variable air volume unless they are designed by a competent engineer and tested to ensure minimum capture requirements are met. Both conditions apply: competent engineering design and testing of the converted arrangement. The Code does not state a numerical minimum-capture value in the supplied conversion provision, so no such value may be inferred from an external source and presented as part of the clause.
A conversion is therefore more than fitting a variable control component to an existing hood. The room pressure relationship, supply air, sash condition, controls and exhaust response form part of the modified system. The supplied Code does not prescribe the detailed conversion methodology, but it expressly prevents conversion without competent design and testing.
Section 3.4(d) states that "chemical fume hoods and laboratory hoods shall maintain an average minimum air velocity of 19 meters/min when in use. For VAV systems, the system shall maintain this velocity when the sash is fully open". The required average minimum is 19 metres per minute, with the measurement condition being when the hood is in use. For variable air volume systems, the Code additionally states that this velocity is to be maintained when the sash is fully open.
"A minimum of 9 measurements shall be taken in various locations of the working area of the chemical fume hood or laboratory hood to ensure minimum average air velocity is met. No result shall be less than 13.5 meters/min." The average is assessed from at least nine measurements taken at various locations in the hood working area. The individual-result minimum is 13.5 metres per minute under that same working-area measurement arrangement, and the purpose stated by the Code is to verify the required minimum average air velocity.
The nine-point minimum prevents an acceptable average from being based on too few locations, while the individual limit prevents very low local results from being hidden by stronger readings elsewhere. The Code does not specify the exact grid arrangement, instrument type or measurement duration in the supplied wording. Those details must not be invented as ADPHC requirements.
Section 3.4(d) states: "At a minimum, six air changes per hour will be required for hazardous materials laboratories, but this can be increased depending on the materials used in the laboratory." Six air changes per hour is therefore the Section 3.4(d)(iii) minimum for hazardous materials laboratories, with the stated condition being that the space is a hazardous materials laboratory; the Code allows an increase depending on the materials used.
That provision must not be blended with ADPHC CoP 8.0 General Workplace Amenities Section 3.7(f)(v), which gives 6 to 12 air changes per hour for laboratories in an HVAC context. The 6 to 12 air-changes-per-hour range belongs to ADPHC CoP 8.0 Section 3.7(f)(v), with the stated context being laboratories within that Code's HVAC provision. It is a different clause in a different Code from the six-air-changes-per-hour minimum for hazardous materials laboratories in ADPHC CoP 52.0 Section 3.4(d)(iii).
Portable, non-ducted fume hoods, including units that use a filter to clean the air, are not acceptable for use with hazardous chemicals. Sashes must be made from safety glass, and polycarbonate sashes must not be used for chemical contaminants. The Code supplies no exception in the quoted provisions based on filter selection or contaminant quantity.
All hoods must have a working airflow indicator installed. Airflow indicators must be checked during regular hood maintenance to confirm that they operate appropriately and must be calibrated annually. Annually is a calibration interval, not a measured quantity, and no averaging period or sampling basis applies to it.
Section 3.4(f) states that hoods must have their performance tested and certified annually by an Emirates Authority for Standardization and Metrology approved third-party entity. Annually is a test and certification interval rather than a measured quantity. Testing must be based on manufacturer recommendations, applicable international standards and international best practices, and a competent person must be responsible for the annual testing and certification.
All identified deficiencies must be reported and corrected. Hoods unable to provide appropriate airflow or found to leak contaminants must be taken out of service until repairs have been completed. The Code does not provide an alternative period of restricted operation for such hoods in the supplied wording.
Section 3.4(f)(v) states that "LEV systems shall undergo a daily visual pre-operation check and inspection", while Section 3.4(f)(vi) states that "LEV systems shall undergo monthly inspection of air cleaning and filtration components and maintenance as required." Daily and monthly are inspection frequencies rather than measured quantities. Both clauses use the broader words "LEV systems", although they are positioned inside Section 3.4 concerning fume hoods; the wording and placement can be reported, but the Code's unstated scope must not be expanded or narrowed by assumption.
ADPHC Code of Practice CoP 52.0 is issued by the Abu Dhabi Public Health Centre under ADOSH-SF and is mandatory for employers in the Emirate of Abu Dhabi. These laboratory hood provisions are Abu Dhabi requirements only.
ADPHC CoP 52.0 Version 4.1 Sections 3.4(a) to 3.4(f); ADPHC CoP 8.0 General Workplace Amenities Section 3.7(f)(v) is a separate amenities provision.
ADPHC CoP 52.0 Section 3.4(d), issued by the Abu Dhabi Public Health Centre under ADOSH-SF and mandatory for employers in the Emirate of Abu Dhabi, requires chemical fume hoods and laboratory hoods to maintain an average minimum air velocity of 19 metres per minute when in use. For variable air volume systems, that velocity must be maintained when the sash is fully open. At least nine measurements must be taken at various locations in the hood working area to verify the minimum average, and no individual result under that measurement arrangement may be below 13.5 metres per minute. The supplied wording does not state the exact measurement grid, instrument or measurement duration.
ADPHC CoP 52.0 Section 3.4(d)(iii) requires a minimum of six air changes per hour for hazardous materials laboratories, with the possibility of an increase depending on the materials used. ADPHC CoP 8.0 General Workplace Amenities Section 3.7(f)(v) separately gives 6 to 12 air changes per hour for laboratories in an HVAC context. The range in CoP 8.0 and the minimum in CoP 52.0 are different provisions in different Codes with different stated scopes and must not be merged. Both Codes are issued within the Abu Dhabi occupational safety and health framework, but the relevant clause and context must accompany each figure.
ADPHC CoP 52.0 Section 3.4(f), issued by the Abu Dhabi Public Health Centre under ADOSH-SF and mandatory for employers in the Emirate of Abu Dhabi, requires annual performance testing and certification of hoods by an Emirates Authority for Standardization and Metrology approved third-party entity, with a competent person responsible for the work. Identified deficiencies must be reported and corrected, and hoods unable to provide appropriate airflow or leaking contaminants must be taken out of service until repaired. Section 3.4(f)(v) states that "LEV systems" must receive a daily visual pre-operation check and inspection, while Section 3.4(f)(vi) states that "LEV systems" must receive monthly inspection of air-cleaning and filtration components and maintenance as required. Those broader words appear within the fume-hood section, and the wording and placement should be reported without assigning a scope that the Code does not expressly state.
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