1、BRITISH STANDARDBS EN 14175-4:2004 Fume cupboards Part 4: On-site test methodsICS 71.040.10; 91.140.30nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnu
2、ll nullnullnullnullnullnullnullnullnull nullnullnullIncorporating corrigendum January 2014National forewordThis British Standard is the UK implementation of EN 14175-4:2004. Together with BS EN 14175-1:2003, BS EN 14175-2:2003, BS EN 14175-3:2003, DD CEN/TS 14175-5:2006 and BS EN 14175-6:2006, BS EN
3、 14175-7:2012, it supersedes BS 7258-1:1994, BS 7258-2:1994, BS 7258-3:1994 and BS 7258-4:1994 which are withdrawn.The UK committee advises that prior to purchasing a fume cupboard, a risk assessment should be performed to assess the risks associated with the substances that are to be manipulated. T
4、his would ensure that the fume cupboard is suitable for its intended purpose and that current exposure limits for toxic substances are not exceeded. It is suggested, therefore, that users may need to draw up a specification appropriate to their particular requirements, within the overall permissible
5、 limits of this standard and the information on installation included in the National Annex. For users with little experience of purchasing fume cupboards, it may be helpful for trade associations, employers bodies or other organizations associated with a particular activity to give guidance on a su
6、itable specification. An example would be Building Bulletin 88 from the Architects b) the type designation including the year of production; c) the date of commissioning testing and the reference to the type test report; d) the general room air conditions during air flow tests, including temperature
7、, barometric pressure, air humidity and pressure difference between room and the adjacent space as well as make-up air and room extract air;e) the status of fume cupboards and other extract devices in the room and the specific position of the tested fumecupboard; f) the results of the inspections (s
8、ee 5.2); EN 14175-4:200414 g) the results of the tests perf ormed during the commissioning testing in accordancewith the test resultrequirements specified for each test (see 5.4 to 5.11);h) a reference to this document EN 14175-4 and the testmethod(s) from this document which has/have beenperformed.
9、 Those test results intended to serve as reference values for subsequent routine testing should be documented inan additional table under the header “Reference values for routine testing“. 9.2Test report for routine testing of type tested fume cupboards (see Clause 6)The routine test report shall in
10、clude the fol lowing items as a minimum:a) individual identification number of the fume cupboard and date of test; b) the reference to the type test report, t he commissioning test report and the last routine test report, if available;c) the general room air conditions during air flow tests, includi
11、ng temperature, barometric pressure, air humidity and pressure difference between room and the adjacent space as well as make-up air and room extract air;d) the status of fume cupboards and other extract devices in the room and the specific position of the tested fumecupboard; e) the results of the
12、inspections (see 6.7); f) the results of the tests performed during the routine testing in acc ordancewith the test result requirementsspecified for each test (see 6.2 to 6.6); g) a reference to this document EN 14175-4 and the testmethod(s) from this document which has/have beenperformed. 9.3Test r
13、eport for qualification testing of non type tested fume cupboards (see Clause 7)According to 9.1 as far as applicable. 9.4Test report for routine testing of qualified fume cupboards (see Clause 8)The routine test report shall include the following itemsas a minimum:a) individual identification numbe
14、r of the fume cupboard and date of test; b) the date of qualification testing, the reference to the qualification test report and the last routine test report, ifavailable;c) the general room air conditions during air flow tests, including temperature, barometric pressure, air humidity and pressure
15、difference between room and the adjacent space as well as make-up air and room extract air;d) the status of fume cupboards and other extract devices in the room and the specific position of the tested fumecupboard; e) the results of the inspections (see 6.7); f) the results of the tests performed du
16、ring the routine testing in accordancewith the test result requirementsspecified for each test (see Clause 6); g) a reference to this document EN 14175-4 and the testmethod(s) from this document which has/have beenperformed. EN 14175-4:2004BS EN 14175-4:2004 BSI 2007 15National annex NA (informative
17、)Recommendations for the exchange of information and recommendations for installationNA.1 IntroductionThe requirements contained in the BS EN 14175 series of standards for laboratory fume cupboards supersede the BS 7258 series of standards and these are now withdrawn. However, to ensure completeness
18、 of the requirements in the British implementation of these European standards, the safeguards containedin the BS 7258 series (i.e. recommendations for the exchange of information, installation,selection, use and maintenance) are retained. This informative national annex reproduces clauses 2.1 , 2.2
19、 , 2.3, 2.4, 3.2and 3.3 of BS 7258-2:1994, plus clauses 4.2 and 5 of BS 7258-3:1994.NA.2 Exchange of informationNOTE Clause NA.2 reproduces clauses 2.1, 2.2, 2.3, 2.4 , 3.2 and 3.3 of BS 7258-2:1994.NA.2.1 GeneralIt is strongly recommended that, for laboratory fume cupboards, the information given i
20、nclauses NA.2.2to NA.2.4 of this national annex shouldbe exchanged by the purchaser and the vendor/installer.NA.2.2 Information to be obtained from the purchaser by the vendor/installerNOTE For the purposes of this BritishStandard, it is assumed in this clause that the vendor is the same party as th
21、e installer. Ifthis is not the case both parties should obtain the information listed in items a) to g) but it is necessary only for the installer to obtain the information listed in items h) to n).The following information should be obtainedfrom thepurchaser by the vendor/installer:a) the materialo
22、fconstruction for any part ofthe fume cupboardthat will be affected byfumes emanating from the processes for which thefume cupboard will be used;b) any specific requirements such as minimum flow rate;c) the minimum dimensions of the work surface;d) the normal sash working height, the maintenance sas
23、h height, and the width of the opening in the plane of the sash;e) the services to be fitted;f) the maximum external dimensions of the fume cupboard, and its dismantledcomponents if appropriate, and the dimensions available for access into the building and internal access to where the fume cupboard
24、is to be installed;g) whether the fume cupboard is to be used for manipulation of highly flammable liquids or other particularly hazardous substances;h)the following details of the siting of the fume cupboard:1)general details of the buildingin which the fume cupboard is to be installed,the location
25、 of the laboratory andthe intended siting of the fume cupboard(s) withinthe laboratory;2) the locations of doors, windows, other fumecupboards, other laboratory furniture, ventilationgrilles, diffusers, or otherair moving equipment;3) the absence of any features listed in item2);i)general details of
26、 the intended method of supplying laboratory make-up air and of the room ventilation existing or to beprovided;j) the environment requirements of the laboratory including:1) requirements for the room in which the fume cupboard is to be installed including maximum sound-pressure levels;2)requirements
27、, e.g. noise levels, for other rooms in the building;3) requirements under the Environmental Protection Act 1990 1 for emission exterior to the building;k) the accommodation spaces, routes available and any specific design requirements of the fume extract system, including the range of working tempe
28、ratures and the fittings to be provided, such as flow control devices, alarms andindicators, condensate collectors, and duct washing facilities;l) the locations and details of any existing mechanical, electrical, plumbingand drainage services to be utilizedin connection with the complete fume cupboa
29、rd installation;BS EN 14175-4:200416 BSI 2007m) the following details of the fume cupboard:1) the required air extract volumeflow rates, corresponding face velocity(ies) and pressure drops acrossthe fume cupboard(s);2) whether a facility to vary the set extract volume flow rate is required and, ifso
30、, the range thatisrequired;3) whetherthe fume cupboardextract 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 installationNOTE For the purposes of this British Standard, it is assumed in th
31、is clause that the vendor is the same party as the installer. Ifthis is the case, the information listed should be supplied to the purchaser by the vendor/installer. If this is not the case, the vendorshould supply the information listed to the purchaser, and the installer should obtain the informat
32、ion listed from the purchaser (who will have received it fromthe vendor).The following information should be exchanged before the fume cupboard is installed (see note): a) dimensioneddrawingsof the fume cupboard (including maximum sash opening for access and normal maximum working sash opening corre
33、sponding to the sash positions at the maintenance sash height and the normal maximum sash height respectively);b) an identification of all materials of construction;c)fume cupboard type and serial number;d) all the information reported on successful completion of the type test procedure;e) operating
34、 and maintenance instructions for all the equipment provided, including the pressure loss characteristics of the fume cupboard;f)any specific limitations on use.NA.2.4 Information to be supplied to the purchaser upon installationThe following informationshould be suppliedto the purchaser upon instal
35、lation of the fume cupboard:a)drawings showing the complete final installation provided;b) an identification ofthe materials of construction of the extract system;c) the results of the commissioningtests undertaken by the installer, and any proposed amendmentsto the purchasers requirements;d)operati
36、ng and maintenance instructions for the extract system andfor any laboratory make-up air systems provided by the installer.NA.2.5 Fume extract systemsNA.2.5.1 GeneralNA.2.5.1.1 The primary function of the fume extract system is to safely contain and convey potentially dangerous or obnoxious fumes fr
37、om the fume cupboard to an outside discharge point from which they can be adequately dispersed at an acceptably low concentration.NA.2.5.1.2The extract system comprises a connection or connections to each fume cupboard, the ductwork, a fan or fans anda discharge flue or multi-flue stack. It may, as
38、appropriate, also include equipment for regulatingand indicatingthe extract rate, preventingreverse flow, preventing spread offire and smoke, fume filtration, fume scrubbing, heat recovery, condensate collection, washdown and drainage. A satisfactory installation can be achieved only if all the obli
39、gations of these interrelated aspects are met.NA.2.5.1.3 The extract system (together with the arrangements for laboratory make-up air)should be so designed as to minimize the sensitivity ofthe fumecupboard to the effects of outdoor wind and other sources of air disturbance. The discharge flue shoul
40、d be sited with due regard to the flow pattern of air around the building andshouldbe sufficiently highto minimizetherisk of fumesbeing drawn into buildings through open windows or air intake grilles.BS EN 14175-4:2004 BSI 2007 17NA.2.5.1.4 When in use, the extractsystem within the building shouldbe
41、 atnegative pressure. Fansshould be mounted at roof levelwiththeir outlets connected to the discharge flues and their inlets connectedto the ductwork. If a fan andits associated equipment cannot be accommodated on the roof, it should be installed at ground level, or on an easily accessible platform
42、and the connections arranged such that, in use, anegative pressure is still maintained inall ductwork withinthe building. Ifductwork isunavoidably under positive pressure itis essential that itis so arranged that i f a leak does occur it cannotcreate a hazard. NA.2.5.1.5 The design of the ductwork (
43、and its resulting resistance to the passage of air) and the fan shouldbe such as to satisfy the maximum air flow requirement at operating temperatures for all fume cupboards served by the system. Fan capacities should exceed the operating requirements by at least10%.NOTE Where highly toxic materials
44、 are handled, automatic changeover to a standby fan may be desirable.NA.2.5.1.6 Extract systems should incorporate an air flow control device for each fume cupboard served. If the controldevice is mounted inaneasily accessible position it may be necessary to incorporate a locking arrangement topreve
45、nt unauthorized interference.NA.2.5.1.7 It is often the case that not allthe fume cupboards in a buildingare in use atany one time, and economies in running costs can be achieved byproviding independent extract systems for groups offume cupboards. Flues beyond the extractfans may be grouped and enca
46、sed in multi-flue discharge stacks but usually atthe expense of longer and more complicated flue runs and higher discharge stacks.In order to prevent mixing of fumes that could give riseto unacceptable hazards suchas risk of fire or explosion, fume cupboards should be grouped according to the proces
47、ses to be undertaken.However, the connection of more than one fume cupboard to an extract fan involves the provision of largerand usually more complicated ductwork with anincreased maintenance liability. The need for a standby fan and additional controls andindicators should be considered. A collect
48、ion/dilution system may be used for the dispersal of fumes from a number of individual extract systems or from common extract systems. The collection/dilution duct, discharge fan and commondischarge flue should have a capacity (after allowing for the frequency of fume cupboard use)in excess of the t
49、otal capacity of the extract fans connected to the duct, this excess depending on the quantityofair needed to be drawn in atthe open end of the duct in order to restore the concentration of fumes in the common sections of the systemto an acceptable working level. With this arrangement also, the need for astandby fan and additional safety controls and indicator shouldbe considered.NA.2.5.2 DuctworkNA.2.5.2.1 Ductwork should have a smooth, obstruction-free interior and shouldbe circular in cross-section.NOTE For recommendations regarding services accommodation ducts see BS5588-9 and BS
