Fume Cupboard Guidance Radiation

GUIDANCE ON THE USE

AND TESTING OF FUME CUPBOARDS IN

RADIATION LABORATORIES

Issued February 2007

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Contents Introduction ...............................................................................................................1 General .......................................................................................................................1 Risk Assessment.......................................................................................................1 Selection of Fume Cupboards..................................................................................2 New & Refurbished Fume Cupboards .....................................................................3 Correct Use of Fume Cupboards .............................................................................3

General Considerations ...................................................................................................................... 3 Good Working Practices - Key Considerations................................................................................... 5

Testing & Maintenance .............................................................................................7

University Responsibility ..................................................................................................................... 7 School/Local Responsibility ................................................................................................................ 7 Permits to Work/Work at Roof Level................................................................................................... 7

Measurement of Performance ..................................................................................8

Airflow Indicators................................................................................................................................. 8 Fume Cupboard Testing ..................................................................................................................... 8 Airflow Tests........................................................................................................................................ 8 Additional Performance Checks.......................................................................................................... 9 Reporting of Airflow Problems and other Defects............................................................................... 9

APPENDIX 1 .............................................................................................................10

Diagram of a Typical Ducted Fume Cupboard ................................................................................. 10 Description of Major Components and Features .............................................................................. 11

The Working Aperture................................................................................................................... 11 The Sash ...................................................................................................................................... 11 The Bypass (or Secondary Air inlet)............................................................................................. 11 The Baffle ..................................................................................................................................... 11 The Duct ....................................................................................................................................... 11 The Damper(s) - not shown in diagram ........................................................................................ 11

APPENDIX 2 .............................................................................................................12

Special Requirements for Certain Materials and Procedures........................................................... 12 APPENDIX 3 .............................................................................................................13

Instructions for the Measurement of Face Velocities........................................................................ 13 Testing Procedure ........................................................................................................................ 13 Alternative Testing Procedure ...................................................................................................... 14

APPENDIX 4 .............................................................................................................15

Example Additional Performance Checklist ...................................................................................... 15 APPENDIX 5 .............................................................................................................16

Example Table for Recording Face Velocities.................................................................................. 16

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Introduction Fume cupboards are designed to protect personnel from hazardous or obnoxious fumes, gases or aerosols associated with laboratory processes or experimental procedures.

The purpose of this guidance is twofold:

• To assist Schools and Departments in understanding and meeting the

requirements of health and safety legislation, including the Management of Health & Safety at Work Regulations 1999 [MHSW], and the Control of Substances Hazardous to Health Regulations 2002 [COSHH], as they apply to the selection, use, testing and maintenance of fume cupboards.

• To provide practical advice and guidance to users of fume cupboards.

General The most common type of fume cupboard exhausts to atmosphere via an external duct; it is this type that is recommended for use at the University. A diagram of a typical ducted fume cupboard, with a description of its major components and features, is set out in Appendix 1, pages 10 and 11. Fume cupboards which discharge air back into the work area through an integral filter system (�recirculating� fume cupboards) are not normally recommended and may be unsuitable for medium or high-hazard work, including the use of radioactive materials. Note: It is mandatory to use a fume cupboard for work involving some high energetic beta-emitting radionuclides (e.g. 32P) and all gamma-emitting radionuclides (e.g. 125I), at activities of 37MBq or greater.

Risk Assessment Under both MHSW and COSHH, a suitable and sufficient risk assessment must be undertaken before any work activity commences. During the risk assessment process the assessor should, amongst other things:

• Consider the hazards associated with the materials to be used and with any by-products and end-products that may be produced - this will demonstrate whether a fume cupboard is required to contain the proposed procedure; if so, consider whether the available fume cupboard:

• meets the required standard, or • requires refurbishment to meet that standard, or • should be replaced.

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• Prepare a written experimental protocol paying particular attention to all safety requirements.

• Plan for possible emergencies - e.g. significant releases of toxic or flammable

materials, explosions, or fires.

• Decide upon a suitable testing regime for the fume cupboard - e.g. the frequency and type of testing.

Consider any special requirements to ensure that the risk to others who may be working near the fume cupboard exhaust (normally on the roof of the building) is minimised. Prior to the commencement of the intended work, any special requirements or precautions should be discussed with the Estates & Buildings Department, which administers the roof Permit to Work system.

Selection of Fume Cupboards The key attribute of a fume cupboard is its ability to provide good containment of hazardous fumes, gases or aerosols; however, they are generally not suitable for the containment of dusts and heavier particulate matter - see also Appendix 2, page 12. It is generally accepted that the airflow1 (also referred to as the �face velocity�) through the working aperture must be a minimum of 0.5ms-1 if the fume cupboard is to be used for work with hazardous materials. This is the standard airflow, at a sash opening of 0.5m, to which all University fume cupboards are tested under COSHH. A lower standard may be acceptable if it is to be used solely for the storage of hazardous materials. (BS 7258 does not specify a face velocity figure for adequate performance, though it suggests that face velocities of less than 0.3ms-1 are unlikely to give satisfactory containment.) The following table gives examples of minimum airflows, at a sash opening of 0.5m, recommended for particular operations: Airflow (ms-1) COMMENTS

≥0.7 Suitable for all work, including work with the highest hazard materials, e.g. highly toxic or radioactive materials. However, containment can be significantly reduced at velocities >1ms-1 due to the effects of turbulence.

≥0.5 Generally suitable for most hazardous materials. A velocity of 0.5ms-1 at a sash opening of 0.5m is the accepted �norm� for a general purpose laboratory fume cupboard.

≥0.3 Low hazard work only, or use as a ventilated enclosure (e.g. a designated storage area).

1 The relationship between containment and airflow/face velocity is complex, especially for modern fume cupboards. Determining a quantitative �containment value� or �containment index� is outside the scope of this document, and for most procedures is not required. If the measurement of containment is considered to be an issue, then additional specific tests will need to be undertaken, see BS 7258: 1994 - Laboratory Fume Cupboards: Part 4 Method for determination of the containment value of a laboratory fume cupboard.

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If the minimum required airflow for the type of work being undertaken cannot be obtained with a sash opening of 0.5m, an alternative fume cupboard must be used. It is difficult to give precise guidance on the suitability of a particular fume cupboard for a particular operation; in addition to airflow and containment, consideration may need to be given to other factors such as the materials of construction of the fume cupboard the required services and other special requirements (e.g. filters, scrubbers), as may be determined by the risk assessment.

New & Refurbished Fume Cupboards The specification and selection of a fume cupboard will be the joint responsibility of the commissioning School and the Estates & Buildings Department, in liaison with the specialist contractor/supplier. New fume cupboards should comply with the British Standard, BS 7258:1994; Laboratory Fume Cupboards; refurbished fume cupboards should also meet this standard.

Correct Use of Fume Cupboards Anyone who intends to use a fume cupboard must have received:

• appropriate instruction in their safe use - this is the responsibility of local management.

• details of any local arrangements,

• details of any Safe Operating Procedures (SoPs), etc.

Schools and Departments are therefore encouraged to use the following sections - General Considerations and Good Working Practices - as the basis for producing their own process-specific SoPs.

General Considerations

1. If it is necessary to run a fume cupboard continuously - e.g. if it is the principal means of ventilating the area, or to maintain airflow in an integrated ventilated storage cupboard - then local operating procedures and requirements should always be observed.

2. If fume cupboards share a common duct, their performance may be

interdependent - changing sash heights and damper settings on one could affect the performance of the other(s). Tests should be undertaken to establish under what circumstances, and to what extent, performance is affected; appropriate local guidance, notices, etc., should be prepared and followed.

3. If fume cupboards share a common electrical supply (particularly to the fans)

appropriate local shut-down procedures must be in place and adhered to.

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4. Cross-draughts can significantly affect the containment efficiency of fume cupboards and, whenever possible, the opening of windows and doors (particularly if they are in close proximity to the fume cupboard) should be kept to a minimum. Similarly, rapid movements of personnel near the sash opening should be avoided.

5. Be aware that large objects such as safety screens, ovens, trays, etc., can

cause turbulence, thus reducing the fume cupboard efficiency. This effect can be minimised by raising these objects on suitable blocks to about 50mm above the work surface.

6. Although closing down the sash brings some benefits from the higher airflow

attainable, and in assisting in the containment of splashes, this may cause deterioration of containment efficiency due to an increase in turbulence. It is essential, therefore, to maintain a continuous airflow through the system at any sash opening, thus particular care must be taken with older systems that may not be fitted with stops to prevent the sash from being fully closed.

7. Avoid the use of rotating machinery, e.g. a centrifuge, which could disturb the

airflow pattern. Drying chromatography sheets with a hot air blower will almost certainly result in fumes or aerosols being blown towards the operator.

8. A fume cupboard should not be used as a storage area, unless it has been

specifically designated for that purpose. Conversely, procedures should not be carried out in a fume cupboard that has been designated as a storage area.

9. Electrical socket outlet boards (�extension leads� or �multiple outlet adapters�)

should not be used inside a fume cupboard.

10. If flammable liquids, gases, or vapours are involved in the procedure, then flameproof equipment may be required.

11. Sources of high heat load, e.g. large hotplates, should be avoided if possible

as they create thermal drafts which can disrupt airflow. Particular care should be taken when using a naked flame; they should only be used if essential to the procedure.

12. In the event of a fire, extinguishers should be used with extreme caution. This

applies particularly to those expelling gas at high pressure (e.g. carbon dioxide) which could result in fumes or aerosols being blown out of the fume cupboard (e.g. via the bypass), and could also result in hazardous materials, including burning solvent, being ejected through the sash opening.

13. The operator should never place his/her head inside the fume cupboard whilst

a procedure is running, or when open containers of hazardous materials are in the working chamber.

14. Care must be taken when handling light objects (e.g. plastic bags, paper

towels or expanded polystyrene) to ensure that they are not drawn into the ducting and/or fan blades by the airflow, which could reduce the fume cupboard�s performance.

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Good Working Practices - Key Considerations

1. Prior to commencing any procedure, switch on the fan, if it is not already running, and the fume cupboard light.

2. Set the sash to the recommended working height and ensure that the fume

cupboard is operating satisfactorily by observing the airflow indicators.

3. Open the sash fully (it may be necessary to release the sash limiting stops to enable this) and bring all necessary equipment and chemicals to the cupboard, keeping all chemical containers closed, and place them in the working chamber. This will reduce the need to leave the procedure during subsequent operations, thus minimising potential disturbances to the airflow.

4. Equipment and materials should be placed at least 150mm behind the sash

opening to reduce the production of turbulence and thus the escape of fumes or aerosols back into the laboratory. However, they should not be placed so far back that they block the bottom baffle or other exhaust slots or openings, or encourage the operator into putting his/her head into the cupboard when making adjustments or taking readings.

5. Reduce the sash opening to the recommended working height and start the

procedure.

6. Ensure that brief details of the procedure, the name of the operator/supervisor, the date of commencement, its likely duration, and an emergency contact number, are displayed in a prominent position on or near the fume cupboard.

7. When the procedure is running satisfactorily, further reduce the sash height to

the lowest practicable opening, thus giving the greatest level of containment and also providing some degree of protection against splashes. However, see General Considerations, item 6, page 4, regarding turbulence.

8. Avoid unnecessary operations of the sash whilst the procedure is in progress;

any movements that are necessary should be made suitably slowly.

9. Avoid all rapid movements, especially of the arms within the fume cupboard � which are likely to disturb the airflow and allow contaminants to escape. Note that fumes or aerosols can be attracted towards any person who is leaning too close to the sash opening.

10. If large volumes of fumes are being generated, particularly if there is the risk of

a very violent reaction, close the sash completely, subject to any minimum setting.

11. If it is necessary to clean up any spillages whilst the procedure is running, care

should be taken to avoid rapid movements and other disturbances which may adversely affect the airflow. However, depending upon circumstances, it may be advisable to postpone dealing with the spillage until the procedure is complete.

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12. If the risk assessment has indicated that a procedure should not be left unattended, then the operator must make appropriate arrangements to cover any absences.

13. Sitting directly in front of the fume cupboard should be avoided when higher

risk procedures are in progress; being seated could restrict the operator�s mobility when reacting to an emergency.

14. When the procedure is complete, allow sufficient time to ensure that all fumes

or aerosols have been extracted before raising the sash above the maximum recommended working height.

15. With the fan still on, raise the sash to the setting-up position, close all chemical

containers and dismantle any apparatus.

16. Monitor the fume cupboard chamber - base, walls, sash, etc., for freedom from radioactive contamination. Note: when using 3H materials it will be necessary to take a wipe test to confirm that no contamination is present. If contamination is found this should be reported immediately to the Radiation Protection Supervisor/Local Radiation Assistant who will advise on the course of action to be taken.

17. Remove all equipment and materials that are no longer required, including any

waste products, and return all chemicals to their proper storage location. 18. If necessary, clean the base, walls, sash, etc., of the fume cupboard chamber

to remove any residual chemical (non-radioactive) contaminants.

19. Close the sash; turn off the light and the fan unless it is necessary to leave it running, depending on local operating procedures.

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Testing & Maintenance COSHH requires that all fume cupboards be inspected and tested at least every 14 months and records of these tests kept for at least five years.

University Responsibility

All fume cupboards, fume hoods, associated ductwork, motors, fans and control gear are tested/inspected at least every 14 months (referred to throughout the remainder of this document as the �Annual Check�) by specialist contractors appointed by the Estates & Buildings Department and funded centrally.

School/Local Responsibility

It is the responsibility of the School to ensure that all its fume cupboards are tested regularly by suitably trained members of staff2, to confirm that their performance is maintained between Annual Checks. This may involve testing monthly, or more frequently, depending on circumstances.

Permits to Work/Work at Roof Level

A Permit to Work system is in operation for anyone wishing to gain access to the roof of any University building. A key is issued to an authorised person by Security only upon the presentation of a completed Permit to Work form. If work involves a fume cupboard duct, fan or associated control gear, or requires personnel to be in the immediate vicinity of an operating fume cupboard outlet, then it must be ensured that no significant quantities of hazardous materials are present in the outflow of air. This will require liaison between the issuer of the permit and a responsible person directly involved with the laboratory in which the fume cupboard is situated. As confirmation of this, it is recommended that the permit be countersigned by the responsible person from the laboratory. Depending upon the nature of the work at roof level, and the risks associated with the fume cupboard exhaust, it may be necessary to �lock-out� the fume cupboard electrical system to prevent its use during the roof work, with warning notices displayed on, or adjacent to, the affected fume cupboard. These procedures will normally be instigated by Estates & Buildings Department, or their contractors, after appropriate consultation with the affected School and the local laboratory personnel.

2 An employee who is familiar with the use and operation of local fume cupboards and is proficient in the use of the anemometer equipment.

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Measurement of Performance

Airflow Indicators

Modern fume cupboards are often fitted with both an airflow indicator (possibly some form of meter or gauge) and an audible alarm (a low-flow warning). Most airflow indicators give readings that are probably only semi-quantitative and thus cannot be relied upon as the sole means of accurately determining airflow/velocity. Older fume cupboards may not be fitted with any of these devices. It is recommended that, whether or not an indicator of the above-mentioned type is present, some additional form of simple flow-indicating device be fitted, which will give an immediate approximate visual indication of flow. This is easily achievable by securing a �tell-tale� - a strip of paper, tissue, or cloth - to the lower edge of the sash. The degree of movement inwards of the �tell-tale� is an approximate indication of the velocity of the airflow. Note: Fan motor noise alone is not an indicator of airflow - motor drive belts or other couplings may be broken or loose, fan blades may be loose or damaged, or the duct may be partially blocked.

Fume Cupboard Testing

It is most important that a fume cupboard continues to meet its performance criteria during its lifetime. It is therefore important that regular quantitative airflow tests are undertaken, e.g. on a weekly or monthly basis, depending upon the nature of the work being undertaken; this should be decided at the time of risk assessment of the proposed work. These tests involve measuring the airflow or, more correctly, the average velocity of the air entering the sash opening of the fume cupboard - the �Face Velocity�. These tests, together with the Annual Check, form the basis of demonstrating compliance with the Regulations. Due to variations between measuring devices and the techniques used, it is possible that the results of the Annual Check may differ from those produced locally. If this is the case, confirmed by retest, then a note to that effect should be entered on the record form (see Appendix 5, page 16). Regular local tests are the best indication of performance trends.

Airflow Tests

These tests will require the use of an anemometer - a rotating vane type with a digital electronic readout is recommended. The instrument must be capable of giving accurate, consistent readings and be calibrated regularly. A suitably trained member of staff should undertake both the following airflow tests and additional performance checks.

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The frequency of testing will depend largely upon the type of work being undertaken but, generally, the following can be used as guidance:

1. Weekly on all fume cupboards that are used for high-hazard procedures, e.g. highly toxic or radioactive materials;

2. At least monthly on all other systems; or

3. Immediately when deterioration of the system performance is suspected.

The recommended testing procedure is set out in Appendix 3, pages 13 and 14.

Additional Performance Checks

It is important to ensure that the fume cupboard remains in good overall condition and that checks are carried out on the services integrated into it, e.g. water, electrical supplies and drainage. Most of these checks are visual and can be performed regularly, but it is recommended that a more formalised inspection is performed at least 6-monthly using, for example, the checklist set out in Appendix 4, page 15.

Reporting of Airflow Problems and other Defects

When a problem/defect is detected or suspected, the following procedure should be adopted:

Report to: Action they will take:

Senior member of laboratory staff or academic supervisor. Also report to the Local Radiation Assistant and/or the Radiation Protection Supervisor.

Decide if local remedial action is appropriate or whether Estates & Buildings Department should be contacted - by internal works requisition and/or by telephone to the emergency contact number 4328.

Note: If, for any reason, the problem/defect cannot be reported immediately (e.g. there is no one in authority to whom the report can be made) then it is the responsibility of the person discovering it to take appropriate action depending on its nature and severity, as set out in any Local Rules, SoP, etc. This could involve shutting off the fume cupboard, if safe to do so, and prominently displaying a suitable notice, warning others of the fault and that the fume cupboard must not be used. Any system that has been taken out of service must have a suitable warning notice prominently displayed on or adjacent to it, which must remain in place until a competent person has rectified the defect and the system passed as being safe for use.

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APPENDIX 1

Diagram of a Typical Ducted Fume Cupboard

The major components and features are described on the following page:

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APPENDIX 1 (continued)

Description of Major Components and Features

The Working Aperture This is the opening allowing access to the working chamber.

The Sash This is the moveable glazed window which is adjusted in height to control the size of the working aperture and thus the airflow/face velocity.

The Bypass (or Secondary Air inlet) This limits the increase in airflow/face velocity as the sash is lowered and maintains a stable airflow.

The Baffle This is a useful additional means of stabilising airflows and reducing variations in flow across the sash opening.

The Duct This is the large diameter pipe, generally fabricated of plastic material, which carries the air extracted from the fume cupboard by the fan. The extracted air is exhausted at a suitable velocity, normally at a height of several meters above roof level. Note: Dusts, aerosols, or other particulate matter can be deposited in the duct and vapours and gases can condense to liquid. This can be important if the fume cupboard is used with certain hazardous materials and may require special consideration during the risk assessment (e.g. the use of perchloric acid, see Appendix 2, page 12).

The Damper(s) - not shown in diagram These are often fitted in the duct immediately downstream of the fume cupboard, particularly where two or more cupboards share a common main duct. Their purpose is to assist in balancing the air extracted between each cupboard. Once set up, they should not require alteration and the setting should indelibly marked. It is recommended that these �normal� settings are checked before using the cupboards and before carrying out any airflow checks.

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APPENDIX 2

Special Requirements for Certain Materials and Procedures

In this document, reference is made to �modern, general purpose� fume cupboards (e.g. see table on page 3), which are suitable for the vast majority of work. However, work with certain materials may demand special facilities, fittings, or materials of construction and these issues should be addressed in the Risk Assessment and appropriate advice sought. Examples of such work are:

• Hydrofluoric acid will require impervious plastic work surfaces and glazing;

• Perchloric acid will require impervious surfaces and may also require the installation of a water wash/scrubber system in the ducting near to the fume cupboard.

• Microbiological/biological work may require the fitting of special filters in the

outflow, e.g. HEPA filters. As mentioned elsewhere, fume cupboards are designed to contain �fumes�, e.g. gases, vapours and aerosols, and generally they have not been designed to deal with dusts and heavier particulate matter. When the work involves materials which produce very heavy vapours - e.g. from certain halogenated hydrocarbons, bromine and, particularly, mercury, it should be ensured that airflows and containment are adequate to deal with them.

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APPENDIX 3

Instructions for the Measurement of Face Velocities

The main testing regime, set out below, involves undertaking airflow tests at nine points, in a 3 x 3 matrix, across the sash opening. This test procedure is the one that should be adopted by contractors appointed to undertake the Annual Check. It is also the recommended procedure for the regular testing of fume cupboards involving the following:

• High-hazard work, or

• when there have been modifications to, or servicing of, a cupboard, or

• when other tests or indictors show that there may be a problem with the airflow.

However, it is recognised that in circumstances where the experimental procedure and equipment remain unchanged for some time, it may be acceptable during that period to adopt an alternative regime using either 3 or 1 point testing once an initial 9 point test has been completed - see below for further details.

Testing Procedure

1. All doors and windows in the room should be closed and all fume cupboards and extraction fans switched on. This will enable each fume cupboard to be tested under reproducible conditions3.

2. Where possible, remove all items from the fume cupboard that could be an

obvious disturbance to the airflow4.

3. Check the setting of any external dampers in the ducting, if fitted - see Appendix 1, page 11.

4. Set the sash to an opening height of 0.5m - this is the height from the bottom

edge of the sash above the lip or raised edge of the working surface.

5. Place the anemometer in the sash opening, ensuring that it is correctly orientated in the airflow - usually indicated by a flow direction arrow on the anemometer housing.

3 Note that extreme weather conditions can affect the performance of a fume cupboard and, where possible, testing on very windy days should be avoided. 4 It is appreciated that for safety, or other operational reasons, it may not be possible or desirable to remove all items.

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APPENDIX 3 (continued) 6. Imagine the sash opening being divided into nine equal rectangles, as shown

below. Stand as far as practicable from the fume cupboard with the sensing head of the anemometer in the plane of the sash and take airflow readings at approximately the centres of the nine rectangles.

X(1) X(2) X(3) X(4) X(5) X(6)

X(7) X(8) X(9)

7. Record for each rectangle the average reading over a period of at least ten seconds, or as recommended in the manufacturer�s instructions, applying corrections from any supplied calibration chart. An example of a suitable record form is shown in Appendix 5, page 16.

8. Study the recorded readings and repeat any which differ significantly from the

average.

9. The test results can also be used to �calibrate� any visual indictor or �tell-tale� in the fume cupboard.

Alternative Testing Procedure As mentioned above, measuring at 3 points across the sash or 1 point centrally (see diagram below) may be acceptable:

X X X or X

The results of these tests, which will provide an indication of performance trends, should be recorded. If the measured airflow differs by 10% from the initial 9 point mean airflow, then a full 9 point retest must be undertaken. If a full 9 point retest confirms a 10% reduction from the previous results then the matter must brought immediately to the attention of the appropriate manager/supervisor, see section on Reporting of Airflow Problems and other Defects, page 9.

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APPENDIX 4

Example Additional Performance Checklist

Location: ………………………….. F/C Identification No.: ………………………….………..….

Date of Check: ………... Tested By (Name): ………..…………….. Initials: ……………...

Feature Question Details/Results Action Taken (if any) Work Surface and Linings

Is there any obvious damage?

Baffles

Are any moveable baffles set to the normal operating position?

Glazing

Is there any obvious damage?

Sash Mechanism

Does it function satisfactory? Are there signs of damage to the sash cables?

If stops are fitted to limit the maximum opening height, are they in place and functioning correctly?

Sash Limiting Stops

If stops are fitted to prevent it being closed completely, are they in place and functioning correctly?

Sash Opening Height

If the sash opening needs to be reduced to less than 0.5m to attain the required air velocity, then are appropriate working height markings in place on both sash and frame?

Visual airflow indicators

Are any indicators, including ‘tell-tales’, in place and operating correctly?

Fan

Is there any sound of excessive vibration?

Dampers Are any dampers set to the correct/normal position?

Lighting Is lighting sufficient and working correctly?

Electricity, gas, water and drainage services

Is there any corrosion or damage which makes the services unsafe? (Also check the drip cup, trap and drain for signs of leaks, blockages, etc, and the pipes and wires under the fume cupboard).

Storage Is there any unauthorised storage of chemicals and equipment?

Are the results of the Annual Check prominently displayed and is the test date within the previous 14 months?

Display of results

Are the results of the airflow tests up to date and prominently displayed?

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APPENDIX 5

Example Table for Recording Face Velocities

Aston University Record of Fume Cupboard Face Velocity Tests

School: �� Fume Cupboard Identification Number: ��..

Room Number: ��..

Grid Points across the Sash opening

X(1) X(2) X(3)

X(4) X(5) X(6)

X(7) X(8) X(9)

Face Velocity at a given Grid Point at 0.5m sash opening height (ms-1)

Indicate if velocities fail to meet these criteria:

(x=fail) Date of Test

X(1) X(2) X(3) X(4) X(5) X(6) X(7) X(8) X(9)

Mean Face

Velocity (ms-1) Minimum

standard5 Within 10% of previous6

Signature

5 Any grid point or mean face velocity falls below the minimum required for the type of work being undertaken (see table on page 2). 6 Any grid point or mean face velocity falls by >10% of the previously recorded value or >10% of the Annual Check value.

Fume Cupboard Guidance Radiation

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