30054282 pdf BRITISH STANDARD BS EN 14175 3 2003 Fume cupboards — Part 3 Type test methods ICS 71 040 10; 91 140 30 Incorporating corrigendum February 2014 National foreword This British Standard is t[.]
plane of sash
plane in the middle between the innermost and the outermost screen surfaces of that part of the sash forming the upper boundary of the test sash opening.
NOTE This definition replaces the definition given in EN 14175-1:2003, 5.4.
inner measurement plane
The plane of the sash at the type test opening is defined by specific boundaries It is non-vertical where it does not align with the work surface of the fume cupboard The upper boundary is marked by the lowest point of the upper edge of the type test opening, while the lower boundary is determined by the uppermost point of the lower edge of the opening nearest to the sash The sides of this plane are defined by the edges of the opening.
NOTE 1 See examples in Figures 1 and 2.
NOTE 2 This definition replaces the definition given in EN 14175-1:2003, 7.7.
containment factor (C F )
ratio of calculated concentration of tracer gas in the work space of the fume cupboard to the measured concentration in the inner or outer measurement plane.
NOTE The containment factor is no constant value but depends on the extract volume flow rate and the measured concentration of tracer gas.
4 Test room and general test conditions
Dimensions and construction
The test room must be a cuboid enclosure made of appropriate materials, located within a building or laboratory It should have a minimum internal width and length of 4.0 m and a ceiling height of at least 2.7 m The ceiling and floor must be level, and the room should be free of internal supports, walls, or any obstacles that could disrupt airflow.
Test room conditions
The room air temperature must be maintained at (23 ± 3) °C, with the make-up air temperature during measurements kept within ± 1 °C of the room air temperature It is essential to minimize temperature gradients, and the make-up air should be supplied from a distance greater than 2 meters from the front of the fume cupboard.
The test zone boundary shall extend approx 1,5 m in front of the fume cupboard and approx 1,0 m from the outer sidewalls of the cupboard over the full room height.
Air extraction in the room must occur symmetrically opposite to the make-up air supply and from outside the test zone It is essential to maintain an air speed of less than 0.1 m/s at the boundaries of the test zone, while also ensuring that uncontrolled air streams and draughts do not enter the test room.
Any device the temperature of which exceeds 40 °C, except components which form part of the fume cupboard and/or the test equipment, shall be located outside the test zone boundaries.
The air extracted from the test room shall be discharged to atmosphere in such a way as to prevent its re- entrainment in the make-up air.
Fume cupboard installation
The fume cupboard shall be installed centrally on a wall with its back to the wall.
The test shall be carried out on the fume cupboard installed in the test room in accordance with the manufacturer's installation instructions.
Test conditions
No person other than the operator(s) shall be present in the test room during the measurements No person shall remain in the test zone during the measurements.
There shall be no unnecessary obstructions or equipment within the test zone No equipment other than that necessary for the tests shall be in the fume cupboard.
Windows and doors of the test room shall remain closed during measurements.
NOTE Observance of all test conditions is crucial for reproducibility and comparability of the test results.
The sash must be positioned at a height of 500 mm ± 1 % at the center of the opening In cases where the maximum height is below 500 mm, the maximum operational sash opening should be utilized and recorded Any additional openings used must also be documented in the test report.
Sashes must be positioned at a side opening of 500 mm ± 1% If the maximum sash opening is below 500 mm, the maximum opening should be utilized and recorded The test will be conducted first on one side opening and then repeated on the opposite side Any additional openings used during testing must be documented in the test report.
Vertical sash test: all horizontal sash(es) shall be set to the minimum sash opening and the procedure as in 4.4.2.1 shall be followed.
Horizontal sash test: vertical sash(es) shall be set to the minimum sash opening and the procedure as in 4.4.2.2 shall be followed.
If any additional opening is used, this shall be noted in the test report.
The type testing procedures shall be applied to one example of a production model of the fume cupboard to be tested.
Ensure that the make-up air and extract air systems are adjusted to achieve the necessary flow rates and testing conditions Activate all instruments and data recording devices, allowing adequate time for stabilization of the instruments.
Extract volume flow rate
For each extract volume flow rate setting, the flow rate shall be measured in the extract duct in accordance with ENISO 5167-1 The uncertainty of measurement shall not exceed ± 5 %.
Face velocity
The anemometer must be unidirectional, featuring a directional sensitivity of ± 20° It should have a time constant of less than 0.5 seconds, and the uncertainty in individual measurements must not exceed 0.02 m/s plus 5.
% of the reading in the range of 0,2 m/s to 1,0 m/s An anemometer with a valid calibration certificate shall be used.
A means of recording the output of the anemometer for subsequent analysis shall be provided.
The anemometer probe must be positioned at the intersection points of lines on the inner measurement plane This includes at least three equally spaced lines between the side boundaries, with the outermost lines set at (100 ± 5) mm from the sides, and the intervening lines spaced no more than 400 mm apart Additionally, a series of at least three equally spaced lines should be established between the horizontal boundaries, also with the outermost lines positioned at (100 ± 5) mm from the horizontal edges, maintaining a maximum distance of 400 mm between the outermost and intervening lines.
Measurements should be conducted using the anemometer probe positioned at each grid point, ensuring that the sensor's orientation is perpendicular to the inner measurement plane It is essential to minimize disturbances in the space upstream of the sensor for accurate readings.
Measure and record the individual velocity component viperpendicular to the inner measurement plane at regular intervals of 1,0 s or less for a period of at least 60 s.
Calculate at each measurement point by equation (1) the mean value v of the measured velocity components v i in meter per seconds and round the result to the second decimal place: i n i n v v ∑
1 (1) where n is the number of measurements taken during the period of min 60 s.
Calculate at each measurement point by equation (2) the standard deviation s r of the measured velocity components v i in meter per seconds and round the result to the second decimal place:
Calculate the spatial average velocity (see EN 14175-1:2003, 7.6) in meters per seconds at the type test opening and round the result to the second decimal place.
Containment
The specified test equipment must be utilized, although alternative equipment and/or test gases may be employed if they demonstrate equivalent results within a ± 10% margin It is essential that the materials used in construction do not influence the test outcomes, and all instruments must possess valid calibration.
The tracer gas shall be sulphur hexafluoride (SF6).
The test gas shall be (10 ± 1) % volume fraction of sulphur hexafluoride (SF 6 ) in nitrogen (N 2 ) The storage temperature of the test gas shall be at the test room temperature ± 2 °C.
The test gas flow regulator shall be capable of regulating the flow rate with a maximum permissible error of± 5 %.
The test gas injector must be a hollow cylinder constructed from sintered metal, measuring between 20 mm and 25 mm in length and 10 mm to 15 mm in diameter It is essential that the pressure drop across each injector remains within 10% of the average value Additionally, test gas injectors should be linked to the test gas source using flexible tubes of uniform length.
Each sampling probe shall consist of a tube of internal diameter (10 ±1) mm and a length of at least 100 mm The tube's wall thickness shall not exceed 2 mm.
The sampling manifold will be designed as a hollow cylinder, ensuring a minimum aspect ratio of 10 (diameter to height) Additionally, the connecting tubes of the sampling probe will be uniformly arranged around the cylinder's perimeter, with the manifold outlet positioned centrally.
The sampling probes shall be connected to the sampling manifold by flexible tubes of equal lengths.
The sampling pump shall be capable of operating at a flow rate constant within± 5 %.
The gas analyser including the connected means of recording shall have a detection level of 10 -8 or less volume fraction of the tracer gas.
5.3.1.11 Time constant of the test system
The time constant of the sampling system including gas analyser shall be less than 15 s.
A means of recording the output signal of the gas analyser for subsequent analysis shall be provided The recording interval shall be 2 s or less.
The background concentration of tracer gas in the test room shall not exceed 10 -8 volume fraction.
5.3.3 Positioning of test equipment for inner measurement plane
Nine sampling probes must be organized in a grid pattern created by the intersection of three vertical and three horizontal lines Each line should be spaced 105 mm apart, ensuring an equal distribution of probes across the grid.
The test gas injector (see 5.3.1.5) shall be arranged with its centre in-line and (150 + 5) mm from the centre of the sampling probe grid.
The sampling probe grid must be aligned with the injector, ensuring that the probes are located on the inner measurement plane Additionally, the injector should be placed within the fume cupboard's workspace, positioned at a distance of (150 + 5) mm from the inner measurement plane.
Figure 1 and Figure 2 show examples of the positioning of the inner measurement plane for different designs of fume cupboards.
Figure 2 — Example for exact positioning
The sampling probe grid must be positioned on the inner measurement plane, with its center probe located at the intersection points of a series of equally spaced lines These lines should be placed 130 + 5 mm from the vertical side boundaries, with any intermediate lines spaced no more than 600 mm apart from the outermost lines and from each other Similarly, for the horizontal boundaries, the outermost lines should also be 130 + 5 mm from the edges, with intermediate lines adhering to the same spacing requirement of 600 mm or less.
5.3.4 Positioning of test equipment for outer measurement plane
Nine test gas injectors will be installed within the fume cupboard workspace, positioned on a plane 200 mm plus or minus 5 mm from the sash plane These injectors will be aligned horizontally, directing the test gas flow towards the sash, and arranged in a grid defined by three equally spaced vertical lines located 100 mm plus or minus 5 mm from each extreme side of the sash opening, along with three horizontal lines set at 100 mm plus or minus 5 mm for the bottom line, 250 mm plus or minus 5 mm for the middle line, and the top line.
(650 + 5) mm above the bottom horizontal boundary of the sash opening.
2 horizontal sashes 7 lower reference point
4 handle or airfoil 9 work surface
5 upper reference point 10 test sash opening
Sampling probes must be strategically placed at grid points where lines intersect on the outer measurement plane This involves creating a series of equally spaced vertical lines that extend between the side boundaries of the outer measurement plane, ensuring that the two outermost lines align with these boundaries The spacing of any intermediate lines should be consistent and clearly defined.
The design specifications require that the distance between the outermost lines and from each other must not exceed 400 mm Additionally, a series of horizontal lines should be placed between the outer measurement boundaries, with the two outermost lines positioned 200 mm plus 5 mm from the horizontal edges All intermediate lines must be evenly spaced, maintaining a maximum distance of 200 mm for vertical sashes and 400 mm for horizontal sashes from the penultimate lines and from one another.
Figure 3 shows examples of the positioning of the outer measurement plane for four different designs of fume cupboards.
Where the plane of the sash does not meet the work surface, the lowest row of sampling probes shall be positioned
Sampling probes should be positioned at (50 ± 5) mm from the vertical plane at the front edge of the work surface If the sash handle obstructs the movement of the probes, they should be relocated further away while remaining as close as possible to the outer measurement plane It is essential to document the position of each sampling probe in the test report.
When testing low-level or walk-in fume cupboards, the test report must document the heights of both the injector grid and the sample grid If the test opening exceeds 1000 mm, the distance between horizontal lines can be adjusted to 400 mm instead of the standard 200 mm.
Activate all supply and extraction air systems, adjusting controls to achieve the required flow rates Connect the test gas cylinder to the flow regulator and injector(s), and attach the sampling probes to the collection and analysis system Power on the suction pumps, gas analyser, and data recording/storage system, allowing sufficient time for the instruments to stabilize.
5.3.5.2 Inner measurement plane test procedure
Set the sash to the test sash opening.
Position the sampling probe grid at one of the test positions.
Turn on the test gas, adjust the flow rate to 2,0 l/min and allow it to stabilise.
Measure and record the tracer gas (SF6) concentration for 360 s.
Stop the injection of the test gas and analyse the data according to 5.3.6.1.
Repeat the test at the same test position for two further times if the mean tracer gas (SF6) concentration exceeds a volume fraction of 10 -8 during the test period described in 5.3.6.1.
Repeat the test procedure above for other test positions at the same test opening.
Repeat the test procedure above for other test sash openings according to 4.4.2.
5.3.5.3 Outer measurement plane test procedure
Set the sash to the test sash opening.
Turn on the test gas, adjust the flow rate to 4,5 l/min and allow it to stabilise.
Measure and record the tracer gas (SF6) concentration for 780 s.
After a period of 360 s close the sash to its minimum opening in (1 ± 0,2) s.
After a further period of 240 s open the sash to the test sash opening in (1 ± 0,2) s.
After a further period of 180 s, stop the injection of the test gas and analyse the data according to 5.3.6.2.
Repeat the test for further two times if the mean tracer gas (SF6) concentration exceeds a volume fraction of 10 -8 for any of the test periods described in 5.3.6.2.
Repeat the test procedure above for other test sash openings according to 4.4.2.
5.3.6.1 Inner measurement plane data analyses and results
For each test position and test opening analyse the data as follows:
Discard the data for the initial period of 59 s.
Calculate the mean tracer gas (SF 6 ) concentration 1 as volume fraction for the test period from 60 s to 360 s and round the result to the second decimal place.
Calculate optionally the dimensionless inner measurement Containment FactorCF1 as follows:
C F (3) where q is the flow rate of tracer gas (SF6) and Q is the fume cupboard extract flow rate.
Round the CF1 value to the nearest integer and indicate if the result is limited by the detection limit of the instrument.
5.3.6.2 Outer measurement plane data analyses and results
For each test opening, analyze the data by first discarding the initial 59 seconds Then, calculate the mean concentration of the tracer gas (SF6) as a volume fraction for the period from 60 seconds to 360 seconds, rounding the result to two decimal places.
Calculate optionally the dimensionless outer measurement Containment FactorCF2 as follows:
Round the CF2 value to the nearest integer and specify if the result is constrained by the instrument's detection limit Additionally, calculate the mean concentration of the tracer gas (SF6) as a volume fraction for the test period from 361 seconds to 420 seconds, rounding the result to two decimal places.
Calculate optionally the dimensionless outer measurement Containment FactorCF3 as follows:
Round the CF3 value to the nearest integer and specify if the outcome is constrained by the instrument's detection limit Additionally, calculate the mean concentration of the tracer gas (SF6) as a volume fraction for the test period from 421 seconds to 600 seconds, rounding the result to two decimal places.
Calculate optionally the dimensionless outer measurement Containment Factor CF4 as follows:
Robustness of containment
The test equipment and its arrangement shall be as described in 5.3.
In addition a flat rectangular plate with height of (1,90 ± 0,01) m, width of (0,40 ± 0,01) m and thickness of
A movable plate, measuring (20 ± 5) mm, must be installed in front of the fume cupboard During the robustness of containment test, this plate should traverse the front of the fume cupboard at a speed of (1.0 ± 0.1) m/s.
The test conditions shall be as in 5.3.2.
The test gas injectors and the sampling probes shall be positioned as in 5.3.4.
The flat rectangular plate must be installed upright and perpendicular to the sash plane, positioned 205 mm above the floor and 405 mm from the farthest edge of the sash plane For inclined sash planes, the outermost point of the sash plane serves as the reference for measuring the distance.
Set the sash to the test sash opening.
The plate must be positioned upright and perpendicular to the sash plane, moving back and forth across the fume cupboard's face Its traverse should extend at least 600 mm beyond the fume cupboard's width on both sides, with a pause of 32 seconds between each movement.
Start the test procedure as in 5.4.
Measure and document the concentration of the tracer gas After 60 seconds, initiate the movement of the plate across the fume cupboard for six complete traverses, while continuing to record the gas analyzer signal for an additional 30 seconds Cease the injection of the test gas and analyze the data as specified in section 5.4.5.
Repeat the test procedure for other test sash openings.
For each test sash opening analyse the data as follows:
Discard the initial 59 seconds of data For the test period from 60 to 240 seconds, calculate the mean concentration of the tracer gas SF6 as a volume fraction and round the result to two decimal places.
Calculate optionally the dimensionless Robustness Containment FactorCFRas follows:
C = × ϕ (8) where Q is the fume cupboard extract flow rate and q is the flow rate of tracer gas (SF6).
Round CFR to the nearest integer and indicate if the result is limited by the detection limit of the instrument.
Air exchange efficiency
The test gas shall be as in 5.3.1.3.
The test gas flow rate must ensure that the steady-state volume fraction of tracer gas at the connection point to the extract system is maintained between \$5 \times 10^{-6}\$ and \$8 \times 10^{-6}\$.
The test gas injector shall be as in 5.3.1.5.
The sampling probe shall consist of a tube of (10 ± 1,0) mm internal diameter
The sample probe shall be connected to the gas analyser (see 5.3.1.10) by flexible tubing.
The time constant of the test system shall be less than or equal to one half of the decay time.
A means of recording the output signal of the gas analyser shall be provided The recording interval shall be 0,5 s or less.
5.5.2 Positioning of injector grid and sampling probe
The injector grid must adhere to the specifications outlined in section 5.3.4.1 The sampling probe should be positioned within a straight section of the extract ductwork, at least 10 times the duct diameter, and located 6 diameters downstream from the start of the extract ductwork, centered in its cross-section.
Activate all supply and extraction air systems, adjusting controls to achieve the specified flow rates and conditions Connect the test gas cylinder to the injectors and the sampling probe to the gas analyser, ensuring the sample outlet is linked to the fume cupboard extract duct downstream of the sampling point Power on the sampling pump, gas analyser, and data recording device, allowing adequate time for the instruments to stabilize.
Close the fume cupboard sash(es) to its minimum sash opening.
Turn on the tracer gas (SF6), switch on the test gas flow regulator and adjust the flow rate to result in the required tracer gas concentration in the duct.
Measure and record the tracer gas (SF6) concentration.
After 200 s stop the test gas The tracer gas (SF6) concentration should now start to decay.
Carry on with the measurement and recording of the tracer gas (SF6) concentration for a further period of at least
To determine the air change rate per hour, denoted as \( n \), apply the EN ISO 12569 standard by analyzing the gradient of a log-linear fit This calculation utilizes the measured values from section 5.5.3.2, specifically focusing on the range of tracer gas concentration from 80% to 20% of its initial value.
Calculate the air exchange efficiency in percent as quotient of measured and theoretical air exchange rate, rounding the result to the first decimal place, with equation (9):
100 = ε = (9) where Q is the extract volume flow rate and Vfc is the internal volume of the fume cupboard's workspace.
Pressure drop
The pressure drop of the fume cupboard, as defined in this clause, is the difference in pressure that must be indicated in the manufacturer's manual along with the associated airflow rate.
The test room and the general test conditions shall be as in clause 4.
A device capable of measuring air pressure differences with an uncertainty of measurement not exceeding ±10 % of the reading.
Tests shall be carried out with fume cupboard sash(es) at the type test sash position(s) (see 4.4.2).
To ensure accurate pressure measurement in the extract system, install at least four pressure taps evenly spaced around the circumference of the connecting duct These taps should be interconnected to a single outlet, allowing for the assessment of average pressure in relation to the ambient air pressure in the room.
To ensure accurate measurements, allow the flow to stabilize and record the average pressure drop for a minimum of 60 seconds as specified in section 5.6.3 Additionally, if the cupboard features an integrated pressure tap, measurements should also be taken at this location.
Express the measured pressure drop in Pascal Record the cross sectional area of the connecting duct where the pressure drop was measured.
Sash suspension test
To conduct the test, position the sash in the test sash setting and disconnect one of its suspension devices, ensuring the sash stays close to its original position Repeat this procedure for the remaining suspension devices.
Sash displacement test
Measure the sash displacement force at three positions equidistant along the sash edge(s) for any possible direction of movement.
Protection against splashes
A visual inspection shall be performed whether protection against splashes in accordance with EN 14175-2:2003,7.3.5, is given.
Sash stop and alarm test
The sash stop shall be inspected and functionally tested in respect of the marking on the fume cupboard (see
EN 14175-2:2003, 7.3.1) and its operation in accordance with EN 14175-2:2003, 7.3.2.
The audible and visual sash alarm, if provided in accordance with EN 14175-2:2003, 7.3.2, shall be tested by inspection during an appropriate operation of the sash.
When a fume cupboard is equipped with an integrated air flow indicator, its functionality must be tested to meet the standards outlined in EN 14175-2:2003, section 8.2.
During appropriate operation, the following items must be tested: the alarm activation when the manufacturer-specified or type test established extract volume flow rates are not met, and the visibility of the visual alarm along with the ability to silence the audible alarm, if applicable.
After inspection, it is essential to report any faults in the power supply and the non-availability of the air flow indicator, particularly in cases of sensor contamination, electronic failure, or disconnection, which can be simulated using appropriate methods.
The basic safety requirements outlined in EN 14175-2:2003, sections 7.1 and 7.2, must be tested through visual inspection, functional testing, and dimensional checks using simple measurement tools like a tape measure For measuring and evaluating deformation, refer to EN 14175-2:2003, sections 7.2.2 and 7.2.6, and conduct the assessment in accordance with EN 13150:2001, sections 6.2 and A.3.4.
The use of the requested materials in accordance with EN 14175-2:2003, clause 6, may be proven by manufacturer's declaration or by certificate.
Illuminance must be measured at a minimum of eight evenly distributed points per square meter on the work surface The mean value and uniformity should be calculated in accordance with EN 12665 standards Additionally, the manufacturer must specify and report the Ra-Index.
The type test report must include essential details such as the manufacturer's name and address, the fume cupboard's make or model, and a comprehensive description of its dimensions and features It should also specify the testing party's information, the test date, and the signature of the testing personnel Additionally, the report must outline the instrumentation used, including specifications and calibration, as well as the test procedures and conditions, such as air temperature and humidity Key results to be documented include sash opening, extract volume flow rates, face velocity test outcomes, containment test results with tracer gas concentrations, robustness test findings, air exchange efficiency, pressure drop measurements, sash suspension observations, and sound power levels Finally, the report should reference the European Standard EN 14175-3 and note any deviations.
If sound power levels are stated, they shall be measured in accordance with the guidelines for the use of basic standards given in EN ISO 3740.
If emission sound pressure levels are stated, they shall be measured in accordance with EN ISO 11204.
EN 12469, Biotechnology — Performance criteria for microbiological safety cabinets.
EN ISO 3740, Acoustics — Determination of sound power levels of noise sources — Guidelines for the use of basic standards (ISO 3740:2000).
EN ISO 11204, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound pressure levels at a work station and at other specified positions — Method requiring environmental corrections(ISO 11204:1995).
Recommendations for the exchange of information and recommendations for installation
The BS EN 14175 series of standards for laboratory fume cupboards replaces the withdrawn BS 7258 series To ensure comprehensive requirements in the UK implementation of these European standards, key safeguards from BS 7258, including recommendations for information exchange, installation, selection, use, and maintenance, are retained This national annex includes clauses 2.1, 2.2, 2.3, 2.4, 3.2, and 3.3 from BS 7258-2:1994, along with clauses 4.2 and 5 from BS 7258-3:1994.
NOTE Clause NA.2 reproduces clauses 2.1, 2.2, 2.3, 2.4, 3.2 and 3.3 of BS 7258-2:1994.
For laboratory fume cupboards, it is essential for the purchaser and the vendor/installer to exchange the information outlined in clauses NA.2.2 to NA.2.4 of this national annex.
NA.2.2 Information to be obtained from the purchaser by the vendor/installer
According to this British Standard, it is assumed that the vendor and installer are the same entity If they are different, both parties must gather the information specified in items a) to g), while only the installer is required to obtain the information outlined in items h) to n).
Vendors and installers must gather essential information from purchasers regarding the fume cupboard, including the construction material affected by fumes, specific requirements like minimum flow rate, and the minimum work surface dimensions Additionally, they need to know the normal and maintenance sash heights, the sash opening width, and the required services It's crucial to obtain the maximum external dimensions of the fume cupboard and its components, along with access dimensions for installation Furthermore, it's important to clarify if the fume cupboard will be used for handling highly flammable liquids or other hazardous substances, as well as details about its intended location.
The article provides essential information about the building designated for the installation of the fume cupboard, including the laboratory's location and the specific placement of the fume cupboard(s) within the laboratory space.
2) the locations of doors, windows, other fume cupboards, other laboratory furniture, ventilation grilles, diffusers, or other air moving equipment;
The article highlights the lack of features mentioned in item 2, emphasizing the need for a detailed description of the proposed method for supplying laboratory make-up air and the existing or planned room ventilation Additionally, it outlines the environmental requirements essential for the laboratory's operation.
1) requirements for the room in which the fume cupboard is to be installed including maximum sound- pressure levels;
2) requirements, e.g noise levels, for other rooms in the building;
The Environmental Protection Act 1990 mandates specific requirements for emissions outside buildings, emphasizing the need for well-designed fume extract systems These systems must accommodate designated spaces and routes, incorporating essential features such as flow control devices, alarms, indicators, condensate collectors, and duct washing facilities, all while considering the range of working temperatures Additionally, it is crucial to identify and detail any existing mechanical, electrical, plumbing, and drainage services that will be utilized in the complete installation of the fume cupboard.
1) the required air extract volume flow rates, corresponding face velocity(ies) and pressure drops across the fume cupboard(s);
2) whether a facility to vary the set extract volume flow rate is required and, if so, the range that is required;
3) whether the fume cupboard extract system is to be for continuous or intermittent use; n) the commissioning tests to be undertaken by the installer
NA.2.3 Further exchange of information before installation
According to this British Standard, it is assumed that the vendor and installer are the same entity In such cases, the vendor/installer must provide the necessary information to the purchaser If they are different parties, the vendor is responsible for supplying the information to the purchaser, while the installer must obtain it from the purchaser, who will have received it from the vendor.
Before installing the fume cupboard, it is essential to exchange specific information, including dimensioned drawings that detail the maximum sash openings for access and normal operation, as well as the maintenance sash height Additionally, all materials of construction must be identified, along with the fume cupboard type and serial number It is also necessary to provide documentation confirming the successful completion of the type test procedure, along with operating and maintenance instructions for the equipment, which should include the pressure loss characteristics of the fume cupboard Lastly, any specific limitations on use should be clearly communicated.
NA.2.4 Information to be supplied to the purchaser upon installation