Fume cupboards - Part 3: Type test methods

This document specifies type test methods for the assessment of safety and performance of fume cupboards connected to an exhaust air system. Relevant requirements are specified in EN 14175-2.
For terms and their definitions, EN 14175-1 applies. For safety and performance requirements of fume cupboards, EN 14175-2 applies. For on-site test methods of fume cupboards, EN 14175-4 applies. For the type testing and on-site testing of variable air volume (VAV) fume cupboards, EN 14175-6 applies in addition to this standard. For fume cupboards for high heat and acidic load, EN 14175-7 applies.
For the testing of recirculation filtration fume cupboards, EN 17242:-  applies.
For the testing of microbiological safety cabinets, EN 12469 applies.

Abzüge - Teil 3: Baumusterprüfverfahren

Dieses Dokument legt Baumusterprüfverfahren zur Bewertung der Sicherheit und des Leistungsvermögens von an Abluftanlagen angeschlossenen Abzügen fest. Die entsprechenden Anforderungen sind in EN 14175 2 festgelegt.
Für Begriffe gilt EN 14175-1. Für Sicherheits  und Leistungsanforderungen an Abzüge gilt EN 14175-2. Für Vor-Ort-Prüfverfahren von Abzügen gilt EN 14175-4. Für die Baumusterprüfung und die Vor-Ort-Prüfung von volumenstromgeregelten Abzügen (VAV) gilt EN 14175-6 zusätzlich zu dieser Norm. Für Abzüge für hohe thermische Lasten und Säurelasten gilt EN 14175-7.
Für die Prüfung von Absaugboxen mit Luftrückführung gilt EN 17242:- .
Für die Prüfung von mikrobiologischen Sicherheitswerkbänken gilt EN 12469.

Sorbonnes - Partie 3 : Méthodes d'essai de type

Le présent document spécifie les méthodes d'essai de type pour l'évaluation de la sécurité et des performances des sorbonnes raccordées à un système d'évacuation d'air. Les prescriptions pertinentes sont spécifiées dans l’EN 14175-2.
Pour les termes et leurs définitions, l'EN 14175 1 s'applique. Pour les prescriptionsrelatives à la sécurité et aux performances des sorbonnes, l'EN 14175 2 s'applique. Pour les méthodes d'essai sur site des sorbonnes, l'EN 14175 4 s'applique. Pour les essais de type et les essais sur site des sorbonnes à débit d'air variable, l'EN 14175 6 s'applique en complément de la présente norme. Pour les sorbonnes à haute résistance à la chaleur et aux acides l'EN 14175-7 s'applique.
Pour les essais des sorbonnes à recirculation l’EN 17242:—  ) s'applique.
Pour les essais des postes de sécurité microbiologique, l'EN 12469 s'applique.

Digestoriji - 3. del: Metode preskusa tipa

Ta dokument določa metode preskusa tipa za oceno varnostni in zmogljivosti digestorijev, priključenih na odzračevalne sisteme. Zadevne zahteve so navedene v standardu EN 14175-2. Za izraze in definicije se uporablja standard EN 14175-1. Za zahteve glede varnosti in zmogljivosti digestorijev se uporablja standard EN 14175-2. Za preskusne metode digestorijev na kraju samem se uporablja standard EN 14175-4. Za preskušanje tipov in preskušanje digestorijev s spremenljivim volumnom zraka (VAV) na kraju samem se poleg tega standarda uporablja standard EN 14175-6. Za digestorije za visoke temperature in odvod kislin se uporablja standard EN 14175-7.
Za preskušanje digestorijev za recirkulacijsko filtriranje se uporablja standard EN 17242-1.
Za preskušanje mikrobiološko varnih prostorov se uporablja standard EN 12469.

General Information

Status
Published
Publication Date
30-Apr-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
01-May-2019
Completion Date
01-May-2019

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SLOVENSKI STANDARD
SIST EN 14175-3:2019
01-julij-2019
Nadomešča:
SIST EN 14175-3:2004
Digestoriji - 3. del: Metode preskusa tipa
Fume cupboards - Part 3: Type test methods
Abzüge - Teil 3: Baumusterprüfverfahren
Sorbonnes - Partie 3 : Méthodes d'essai de type
Ta slovenski standard je istoveten z: EN 14175-3:2019
ICS:
71.040.10 Kemijski laboratoriji. Chemical laboratories.
Laboratorijska oprema Laboratory equipment
SIST EN 14175-3:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 14175-3:2019
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SIST EN 14175-3:2019
EN 14175-3
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 71.040.10 Supersedes EN 14175-3:2003
English Version
Fume cupboards - Part 3: Type test methods

Sorbonnes - Partie 3 : Méthodes d'essai de type Abzüge - Teil 3: Baumusterprüfverfahren

This European Standard was approved by CEN on 15 March 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14175-3:2019 E

worldwide for CEN national Members.
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Test room and general test conditions .................................................................................................... 6

4.1 Dimensions and construction ..................................................................................................................... 6

4.2 Test room conditions ..................................................................................................................................... 7

4.3 Fume cupboard installation ........................................................................................................................ 7

4.4 Test conditions ................................................................................................................................................. 7

4.4.1 General ................................................................................................................................................................ 7

4.4.2 Test sash positions ......................................................................................................................................... 7

4.4.3 General procedure .......................................................................................................................................... 8

5 Air flow tests ..................................................................................................................................................... 8

5.1 Extract volume flow rate .............................................................................................................................. 8

5.2 Face velocity ...................................................................................................................................................... 8

5.2.1 Test equipment ................................................................................................................................................ 8

5.2.2 Probe positions ................................................................................................................................................ 8

5.2.3 Test procedure ................................................................................................................................................. 9

5.2.4 Data analysis and results .............................................................................................................................. 9

5.3 Containment ...................................................................................................................................................... 9

5.3.1 Test equipment ................................................................................................................................................ 9

5.3.2 Test conditions .............................................................................................................................................. 10

5.3.3 Positioning of test equipment for inner measurement plane ...................................................... 10

5.3.4 Positioning of test equipment for outer measurement plane...................................................... 12

5.3.5 Test procedure .............................................................................................................................................. 13

5.3.6 Data analysis and results ........................................................................................................................... 14

5.4 Robustness of containment ...................................................................................................................... 15

5.4.1 Test equipment ............................................................................................................................................. 15

5.4.2 Test conditions .............................................................................................................................................. 15

5.4.3 Positioning of test equipment ................................................................................................................. 15

5.4.4 Test procedure .............................................................................................................................................. 16

5.4.5 Data analysis and results ........................................................................................................................... 16

5.5 Air exchange efficiency .............................................................................................................................. 16

5.5.1 Test equipment ............................................................................................................................................. 16

5.5.2 Positioning of injector grid and sampling probe .............................................................................. 17

5.5.3 Procedure........................................................................................................................................................ 17

5.5.4 Data analysis and results ........................................................................................................................... 17

5.6 Pressure drop ................................................................................................................................................ 18

5.6.1 General ............................................................................................................................................................. 18

5.6.2 Test equipment ............................................................................................................................................. 18

5.6.3 Test sash positions ...................................................................................................................................... 18

5.6.4 Positioning of pressure taps..................................................................................................................... 18

5.6.5 Test procedure .............................................................................................................................................. 18

5.6.6 Expression of results ................................................................................................................................... 18

6 Sash tests ......................................................................................................................................................... 18

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SIST EN 14175-3:2019
EN 14175-3:2019 (E)

6.1 Sash suspension test .................................................................................................................................... 18

6.2 Sash displacement test ............................................................................................................................... 18

6.3 Protection against splashes ...................................................................................................................... 18

6.4 Sash stop and alarm test ............................................................................................................................ 18

7 Air flow indicator tests ............................................................................................................................... 19

8 Construction and materials tests ............................................................................................................ 19

9 Illuminance test ............................................................................................................................................. 19

10 Test report ...................................................................................................................................................... 20

Annex A (informative) Sound tests ........................................................................................................................ 21

Annex B (informative) A–deviations ..................................................................................................................... 22

Bibliography ................................................................................................................................................................. 23

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SIST EN 14175-3:2019
EN 14175-3:2019 (E)
European foreword

This document (EN 14175-3:2019) has been prepared by Technical Committee CEN/TC 332

“Laboratory equipment”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by November 2019, and conflicting national standards

shall be withdrawn at the latest by November 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 14175-3:2003.

In comparison with the previous edition, the following technical modification have been made:

— introduction was deleted;
— scope clarified and referene to EN 14175-4 and EN 14175-6 was added;
— inclusion of new terms 3.4 and 3.5 with defintions;
— information testing on walk-in fume cupboards clarified;
— limitation of usage of SF as trace gas according to national legislation;
— revision of data analysis and result in 5.3.6 and 5.4.5;
— inclusion of Annex B “A-deviations”.

EN 14175 consists of the following parts, under the general title Fume cupboards:

— Part 1: Vocabulary
— Part 2: Safety and performance requirements
— Part 3: Type test methods
— Part 4: On-site test methods

— Part 5: Recommendations for installation and maintenance (Technical Specification)

— Part 6: Variable air volume fume cupboards
— Part 7: Fume cupboards for high heat and acidic load

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)
1 Scope

This document specifies type test methods for the assessment of safety and performance of fume

cupboards connected to an exhaust air system. Relevant requirements are specified in EN 14175-2.

For terms and their definitions, EN 14175-1 applies. For safety and performance requirements of fume

cupboards, EN 14175-2 applies. For on-site test methods of fume cupboards, EN 14175-4 applies. For

the type testing and on-site testing of variable air volume (VAV) fume cupboards, EN 14175-6 applies in

addition to this standard. For fume cupboards for high heat and acidic load, EN 14175-7 applies.

For the testing of recirculation filtration fume cupboards, EN 17242:— applies.
For the testing of microbiological safety cabinets, EN 12469 applies.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 12665, Light and lighting — Basic terms and criteria for specifying lighting requirements

EN 14175-1:2003, Fume cupboards — Part 1: Vocabulary
EN 14175-2:2003, Fume cupboards — Part 2: Safety and performance requirements
EN 14175-6, Fume cupboards — Part 6: Variable air volume fume cupboards

EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular

cross-section conduits running full — Part 1: General principles and requirements (ISO 5167-1)

EN ISO 12569, Thermal performance of buildings and materials — Determination of specific airflow rate

in buildings — Tracer gas dilution method (ISO 12569)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 14175-1:2003 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
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
[SOURCE: EN 14175-1:2003, 5.4, modification — plane is defined in more detail]
Under preparation. Stage at the time of publication: prEN 17242:2018.
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)
3.2
inner measurement plane

plane of sash at the type test opening, except where the plane of sash does not meet the work surface of

the fume cupboard
Note 1 to entry: In the latter case, it is a non-vertical plane bounded

— at the top by the lowest point of the upper edge of the type test opening in the plane of the sash,

— at the bottom by the uppermost point of the lower edge of the opening closest to the plane of sash, and

— at the sides by the side edges of the opening.
Note 2 to entry: See examples in Figures 1 and 2.

Note 3 to entry: This definition replaces the definition given in EN 14175-1:2003, 7.7.

3.3
containment factor

ratio of the calculated volume concentration of tracer gas in the workspace of the fume cupboard to the

measured volume concentration in the inner or outer measurement plane

Note 1 to entry: The containment factor is not a constant value but depends on the extract volume flow rate and

the measured concentration of tracer gas.
3.4
protection factor

ratio of the volume flow rate of the tracer gas to the measured volume flow rate of the tracer gas in the

tidal breathing flow

Note 1 to entry: The protection factor should not be compared to other known protection factors, e.g.

respiratory protective equipment.
3.5
tidal breathing flow

volume flow rate of air moved in and out of human lungs during sedentary breathing

Note 1 to entry: For healthy adults, it is in the range of 6 l/min to 10 l/min. For the purposes of this standard,

10 l/min is used.
4 Test room and general test conditions
4.1 Dimensions and construction

The test room shall consist of an enclosure of cuboid shape, constructed of suitable materials, within a

building or laboratory. The internal width and length shall be not less than 4,0 m and the ceiling height

not less than 2,7 m. The ceiling and floor shall be level and the room shall be devoid of internal

supports, internal walls or other obstacles to the airflow.
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)
4.2 Test room conditions

The room air temperature shall be (23 ± 3) °C. The make-up air temperature during measurements

shall be room air temperature ±1 °C. Temperature gradients shall be avoided as far as possible. The

make-up air shall be supplied at a distance greater than 2 m from the front of the fume cupboard.

The test zone boundary shall extend approximately 1,5 m in front of the fume cupboard and

approximately 1,0 m from the outer sidewalls of the fume cupboard over the full room height.

Room extract air shall be extracted symmetrically on the opposite side to the make-up air supply and

from outside the test zone. The air speed shall be less than 0,1 m/s at the test zone boundaries. Care

shall be taken regarding uncontrolled air streams and draughts entering into 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.
4.3 Fume cupboard installation

The fume cupboard shall be installed centrally on a wall with its opening facing away from 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.
4.4 Test conditions
4.4.1 General

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 repeatability of the test results.

4.4.2 Test sash positions
4.4.2.1 Vertical sash fume cupboards

The sash shall be set to the height of (500 ± 5) mm measured in the centre of the opening. If the

maximum height is less than 500 mm, the maximum operational sash opening shall be used and noted.

If any additional opening is used, this shall be noted in the test report.

For the testing of walk-in fume cupboards, the upper sash opening shall be used as test sash position.

The lower edge of the sash opening should be at least 900 mm above floor level. If the physical

configuration of the walk-in fume cupboard does not allow this positioning of the sash, the height of the

lower edge shall be noted in the test report.
4.4.2.2 Horizontal sash fume cupboards

Sash(es) shall be set at one side opening of (500 ± 5) mm . If the maximum sash opening is less than

500 mm, then the maximum opening shall be used and noted. The test shall be carried out with the first

side opening and shall be repeated with the opening at the other side. If any additional opening is used,

e.g. openings at both sides of the sash, this shall be noted in the test report.
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)
4.4.2.3 Combination sash(es)

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.
4.4.3 General procedure

The type testing procedures shall be applied to one example of a production model of the fume

cupboard to be tested.

Adjust the make-up air and extract air systems to give the required volume flow rates and test

conditions. Switch on all instruments and data recording (storing) device(s), and allow sufficient time

for the instruments to stabilize.
5 Air flow tests
5.1 Extract volume flow rate

For each extract volume flow rate setting, the volume flow rate shall be measured in the extract duct in

accordance with EN ISO 5167-1. The uncertainty of measurement shall not exceed ±5 %.

5.2 Face velocity
5.2.1 Test equipment
5.2.1.1 Anemometer

The anemometer shall be of the unidirectional type with a directional sensitivity of ±20°. The time

constant of the anemometer shall be less than 0,5 s. The uncertainty of an individual measurement shall

not exceed 0,02 m/s + 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.
5.2.1.2 Data recording

A means of recording the output of the anemometer for subsequent analysis shall be provided.

5.2.2 Probe positions

The anemometer probe shall be positioned at points formed by the intersection of lines on the inner

measurement plane with tolerance of ±5 mm (see examples in Figure 1) as follows:

a) A series of at least three equally spaced lines between the side boundaries of the inner

measurement plane with the two outermost lines 100 mm from the side boundaries. The lines in

between shall be at a distance of maximum 400 mm from the outermost lines and to each other.

b) A series of at least three equally spaced lines between the horizontal boundaries of the inner

measurement plane with the two outermost lines 100 mm from the horizontal boundaries. The

lines in between shall be at a distance of maximum 400 mm from the outermost lines and to each

other.
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)
5.2.3 Test procedure

Measurements shall be made with the anemometer probe located at each of the measurement grid

points. Adjust the orientation of the sensor so that its measurement direction is perpendicular to the

inner measurement plane. Disturbances to the space upstream of the sensor shall be minimized.

Measure and record the individual velocity component v perpendicular to the inner measurement

plane at regular intervals of 1,0 s or less for a period of at least 60 s.
5.2.4 Data analysis and results

Calculate at each measurement point by Formula (1) the mean value v of the measured velocity

components v in metres per second and round the result to the second decimal place:

(1)
vv=
i=1
where
n is the number of measurements taken during the period of at least 60 s.

Calculate at each measurement point by Formula (2) the standard deviation s of the measured velocity

components v in metres per second and round the result to the second decimal place:

vv−
( )
i=1
s = (2)
n− 1

Calculate the spatial average velocity (see EN 14175-1:2003, 7.6) in metres per second at the type test

opening and round the result to the second decimal place.
5.3 Containment
5.3.1 Test equipment
5.3.1.1 General

The following test equipment shall be used. Other equipment and/or test gas may also be used provided

that it is proven to give the same results within ±10 %. Materials of construction should not affect the

test results. All instruments shall have a valid calibration.

Annex B includes information about national deviations regarding the tracer gas respectively test gas.

5.3.1.2 Tracer gas

The tracer gas shall be sulphur hexafluoride (SF ), were allowed in national regulations.

5.3.1.3 Test gas

The test gas shall be (10 ± 1) % volume fraction of sulphur hexafluoride (SF ), were allowed in national

regulations, in nitrogen (N ). The storage temperature of the test gas shall be at the test room

temperature ±2 °C.
5.3.1.4 Test gas flow regulator

The test gas flow regulator shall be capable of regulating the volume flow rate with a maximum

permissible error of ±5 %.
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)
5.3.1.5 Test gas injector

The test gas injector shall be a hollow cylinder made of sintered metal with a length between 20 mm

and 25 mm and a diameter between 10 mm and 15 mm. The pressure drop through each test gas

injector shall be within 10 % of their mean value. Test gas injectors shall be connected to the test gas

source by flexible tubes of equal length.
5.3.1.6 Sampling probe

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.
5.3.1.7 Sampling manifold

The sampling manifold shall be a cylinder. The sampling probe connecting tubes shall be evenly

distributed around the perimeter of the cylinder with the manifold outlet in the centre.

5.3.1.8 Connecting tubing

The sampling probes shall be connected to the sampling manifold by flexible tubes of equal lengths.

5.3.1.9 Sampling pump

The sampling pump shall be capable of operating at a volume flow rate constant within ±5 %.

5.3.1.10 Gas analyser

The gas analyser including the connected means of recording shall have a detection level of 10 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.

5.3.1.12 Data recording

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.
5.3.2 Test conditions

The background concentration of tracer gas in the test room shall not exceed 10 volume fraction.

5.3.3 Positioning of test equipment for inner measurement plane

Nine sampling probes (see 5.3.1.6) shall be arranged in a grid formed by the intersection of lines with

tolerance of ±5 mm as follows:

a) Three equally spaced lines in the vertical direction. The space between the lines shall be 100 mm.

b) Three equally spaced lines in the horizontal direction. The space between the lines shall be

100 mm.

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 probes shall be positioned so that the sampling probes opening are on the inner

measurement plane. The end of the injector nozzle shall be positioned in the workspace of the fume

cupboard on a plane (150 ± 5) mm from the inner measurement plane.
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)

Figure 1 and Figure 2 show examples of the positioning of the inner measurement plane for different

designs of fume cupboards.
Key
1 inner measurement plane
2 test sash opening
Figure 1 — Inner measurement plane
Key
1 sash plane 6 inner measurement
2 horizontal sashes 7 lower reference point
3 sash frame 8 airfoil
4 handle or airfoil 9 work surface
5 upper reference point 10 test sash opening
Figure 2 — Example for exact positioning
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SIST EN 14175-3:2019
EN 14175-3:2019 (E)

The sampling probe grid shall be positioned on the inner measurement plane with its centre probe at

points formed by the intersection of lines with a tolerance of ±5 mm as follows:
c) A series of equally spaced lines between the vertical side boundarie
...

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