【正文】 s air flow with the room air flow. Based on the test result, it should be decided whether subsequent tests, such as room air velocity test (see ), are necessary. EN 141754:2022 9 Licensed copy:PONTYPRIDD COLLEGE, 06/03/2022, Uncontrolled Copy, 169。s documentation identification and the reference measuring point(s). Pressure drop test Objectives The aims of the pressure drop test as part of the missioning testing are to obtain reference values for subsequent routine testing (see ) and to verify the pressure drop at the current installation of the fume cupboard, pared to the intended pressure drop. Test equipment and test procedure According to EN 141753:2022, to . If the fume cupboard39。s manufacturer. Test procedure according to EN 141753:2022, . Expression of results Take the extract volume flow corresponding to the measured pressure difference from the table or diagram supplied in the manufacturer39。s manufacturer. Test equipment in accordance with EN 141753:2022, . Positioning of pressure tap(s) and test procedure The test shall be carried out with the fume cupboard39。s sash(es) set at one of the type test sash opening(s) (see EN 141753:2022, ). Test procedure and test results According to EN 141753:2022, and . EN 141754:2022 8 Licensed copy:PONTYPRIDD COLLEGE, 06/03/2022, Uncontrolled Copy, 169。s declarations. Lighting (see EN 141752:2022, ) Services Materials The following items shall be proven by the type test certificate of the fume cupboard. Containment (see EN 141753:2022, ) Robustness of containment (see EN 141753:2022, ) Air exchange efficiency (see EN 141753:2022, ) EN 141754:2022 7 Licensed copy:PONTYPRIDD COLLEGE, 06/03/2022, Uncontrolled Copy, 169。s installation instructions (see EN 141752:2022, 10b). Protection against splashes (see EN 141753:2022, ) Sash suspension and sash stop (see EN 141753:2022, and ) Sash displacement force (see EN 141753:2022, ) Conformity of the fume cupboard to the type tested unit Services (see EN 141752:2022, Clause 9) Materials (see EN 141752:2022, Clause 6) Correct mechanical assembling and integrity after installation Pressure relief if supplied (see EN 141752:2022, ) Accessibility of construction parts (see EN 141752:2022, ) Manufacturer39。 BSI 1 Scope This document specifies a selection of onsite test methods for the following general purpose fume cupboards: ? Fume cupboards designed in accordance with Part 2 of this European Standard and type tested in accordance with Part 3 of this European Standard. ? Fume cupboards designed in accordance with Part 2 of this European Standard and not type tested. The test methods are designed to be used at the place of installation of the fume cupboard, usually a laboratory. They are used for missioning after installation, for maintenance and for qualification purposes. For certain customer requirements additional or modified test methods may be necessary. It is in the responsibility of the purchaser or user of a fume cupboard to decide which tests are to be performed. The missioning testing can be selected and carried out from the type test methods. For routine testing, the number of test methods selected can be further reduced. 2 Normative references The following referenced documents are indispensable for the application 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 141751:2022, Fume cupboards – Part 1: Vocabulary. EN 141752:2022, Fume cupboards – Part 2: Safety and performance requirements. EN 141753:2022, Fume cupboards – Part 3: Type test methods. EN 616721, Electroacoustics – Sound level meters – Part 1: Specifications (IEC 616721:2022). EN ISO 11202, Acoustics – Noise emitted by machinery and equipment – Measurement of emission sound pressure levels at a work station and at other specified positions – Survey method in situ (ISO 11202:1995). ISO 5221, Air distribution and air diffusion Rules to methods of measuring air flow rate in an air handling duct. 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 141751:2022 and EN 141753:2022 apply. NOTE Attention is drawn to EN 141753 where some definitions given in EN 141751 have been modified. 4 General onsite test conditions Windows and doors of the room shall remain closed during measurements. There shall be no unnecessary obstructions or equipment in neighbourhood of the fume cupboard under test. The general and the specific test conditions during all onsite tests, including makeup air sources and all extract air openings, shall be carefully considered and documented in the onsite test report according to Clause 9. EN 141754:2022 6 Licensed copy:PONTYPRIDD COLLEGE, 06/03/2022, Uncontrolled Copy, 169。s declarations ....................................................................................................................... 12 Face velocity test ......................................................................................................................................... 12 Extract volume flow rate test...................................................................................................................... 12 Pressure drop test ....................................................................................................................................... 12 Air flow visualization ................................................................................................................................... 12