============================= ˳öåíç³éíà "ÀÂÊ-5" ðåäàêö³ÿ 3.6.3. (9150 ãðí). ˳öåíç³ÿ òà âñòàíîâëåííÿ çà 1 ãîäèíó. Àíàëîã ÀÂÊ-5 - «Åêñïåðò-Êîøòîðèñ» ëîêàëüíà âåðñ³ÿ íà 1 ÏÊ (3900 ãðí). «Åêñïåðò-Êîøòîðèñ» ìåðåæåâà âåðñ³ÿ (5200 ãðí). «Åêñïåðò-Êîøòîðèñ» ïðàöþº ï³ä Windows, Linux ³ MacOS «Åêñïåðò-Êîøòîðèñ» ìîæå ïðàöþâàòè íà ôëåø-íîñ³ÿõ. Ñëóæáà òåõ.ï³äòðèìêè http://cct.com.ua/ (050)330-54-00, (068)201-77-62, (093)902-93-85 ============================= Òåêñò â ôîðìàò³ TXT áåçêîøòîâíî íàäàºòüñÿ äëÿ îçíàéîìëåííÿ. ============================= Äëÿ îòðèìàííÿ ïîâíîãî îðèã³íàëó òåêñòó íàä³øë³òü çàÿâêó íà åëåêòðîííó ïîøòó cct.com.ua@gmail.com ============================= EUROPEAN STANDARD EN 13141-6 NORME EUROPEENNE EUROPAISCHE NORM December 2014 ICS 91.140.30 Supersedes EN 13141-6:2004 English Version Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 6: Exhaust ventilation system packages used in a single dwelling Ventilation des batiments - Essais de performance des composants/produits pour la ventilation des logements - Partie 6: Kits pour systemes de ventilation par extraction pour le logement individual Luftung von Gebauden - Leistungsprufung von Bauteilen/Produkten fur die Luftung von Wohnungen - Teil 6: Baueinheiten fur Abluftanlagen fur eine einzelne Wohnung This European Standard was approved by CEN on 6 September 2014. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG CEN-CENELEC Management Centre: Avenue Mamix 17, B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13141-6:2014 E EN 13141-6:2014 (E) Contents Page Foreword..............................................................................................................................................................................4 Introduction........................................................................................................................................................................6 1 Scope....................................................................................................................................................................8 2 Normative references........................................................................................................................................9 3 Terms and definitions....................................................................................................................................10 4 Symbols and abbreviations.........................................................................................................................11 5 Performance testing of aerodynamic characteristics............................................................................12 5.1 General................................................................................................................................................................12 5.2 Test installation and conditions...................................................................................................................13 5.2.1 Test configuration............................................................................................................................................13 5.2.1.1 Test installation................................................................................................................................................13 5.2.1.2 Maximum airflow test configuration.........................................................................................................13 5.2.1.3 Minimum airflow test configuration............................................................................................................14 5.2.1.4 Boosted airflow test configuration.............................................................................................................14 5.2.1.5 Energy efficiency test — reference configuration..................................................................................14 5.2.2 Installation of duct connecting roof/wall outlet terminal to the fan unit...........................................16 5.2.3 Installation of ducts connecting exhaust air terminal devices and fan unit.................................. 16 5.2.4 Test conditions.................................................................................................................................................17 5.2.4.1 Exhaust conditions...........................................................................................................................................17 5.2.4.1.1 Normal conditions....................................................................................................................................17 5.2.4.1.2 Wind conditions.......................................................................................................................................18 5.2.4.2 Temperature.......................................................................................................................................................18 5.2.4.3 Electrical conditions.......................................................................................................................................18 5.3 Test procedure..................................................................................................................................................18 5.4 Presentation of results...................................................................................................................................18 6 Performance testing of external leakages................................................................................................19 7 Performance testing of electrical power...................................................................................................20 7.1 General................................................................................................................................................................20 7.2 Method................................................................................................................................................................21 7.3 Analysis of results...........................................................................................................................................21 7.4 Presentation of results...................................................................................................................................21 8 Performance testing of energy efficiency.................................................................................................21 9 Performance testing of acoustic characteristic......................................................................................22 9.1 General................................................................................................................................................................22 9.2 Determination of the sound power level of the exhaust air terminal devices or range hood .... 23 9.2.1 Test installation and conditions for exhaust air terminal devices.................................................... 23 9.2.2 Test installation and conditions for range hoods...................................................................................24 9.2.3 Test procedure.................................................................................................................................................24 9.3 Determination of the sound power level of the fan unit........................................................................24 9.3.1 General — Noise radiated through the casing of the unit....................................................................24 9.3.2 Test installation and conditions...................................................................................................................24 2 EN 13141-6:2014 (E) 9.3.3 9.4 Measurements.................................................................................................................................................24 Presentation of the results...........................................................................................................................25 Annex A (informative) Example of compensating mounting for air flow measurement device................26 Bibliography.....................................................................................................................................................................27 3 EN 13141-6:2014 (E) Foreword This document (EN 13141-6:2014) has been prepared by Technical Committee CEN/TC 156 “Ventilation for buildings”, the secretariat of which is held by BSI. 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 June 2015, and conflicting national standards shall be withdrawn at the latest by June 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13141-6:2004. In comparison to EN 13141-6:2004 the following changes have been made: — in Clause 3, introduction of the definition of: maximum and minimum air volume flows (<7vmax and <7vmin), demand control ventilation (DCV), boosted air volume flow (gvboost). short duct and long duct and reference configuration (for the energy efficiency calculation); — in 5.2.2, differentiation of the duct connecting the roof/wall outlet to the fan unit depending if the fan unit outlet is situated on the top of the fan unit or if it is situated on a face of the fan unit; — modification of Figure 6 describing the types of long ducts and long branched ducts (it now explains how to deal with long branched ducts on which there are more than 3 spigots); — modification of Table 1 for the presentation of the aerodynamic characteristics; — adding in Clause 6 of a procedure for the measurement of the external leakage; — adding of Table 2 giving a classification of the external leakage; — in Clause 7, specification of the test conditions for the measurement of the electrical power; — in Clause 8, adding of a paragraph defining the test conditions and the calculation for the obtaining of the energy efficiency; — creation of Table 3 for the presentation of the power consumption results; — in Clause 9, specification of the acoustic test conditions; — in Annex A, modification and explanation of Figure A.1 representing an example of compensating mounting for air flow measurement device. EN 13141 consists of the following parts, under the general title Ventilation for buildings— Performance testing of components/products for residential ventilation-. — Part 1: Externally and internally mounted air transfer devices — Part 2: Exhaust and supply air terminal devices — Part 3: Range hoods for residential use — Part 4: Fans used in residential ventilation systems 4 EN 13141-6:2014 (E) — Part 5: Cowls and roof outlet terminal devices — Part 6: Exhaust ventilation system packages used in a single dwelling — Part 7: Performance testing of a mechanical supply and exhaust ventilation units (including heat recovery) for mechanical ventilation systems intended for single family dwellings — Part 8: Performance testing of un-ducted mechanical supply and exhaust ventilation units (including heat recovery) for mechanical ventilation systems intended for a single room — Part 9: Externally mounted humidity controlled air transfer device — Part 10: Humidity controlled extract air terminal device — Part 11: Positive pressure ventilation systems According to the CEN-CENELEC Internal Regulations, the national standards organizations 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. 5 EN 13141-6:2014 (E) Introduction This European Standard specifies test methods on ventilation system package and permits to avoid tests on each component separately. The performance characteristics of the components/products for residential ventilation are given in EN 13142, [1]. The position of this European Standard in the field of standards for the mechanical building services is shown in Figure 1. 6 EN 13141-6:2014 (E) Figure 1— Position of EN 13141-6 in the field of the mechanical building services 7 EN 13141-6:2014 (E) 1 Scope This European Standard specifies laboratory methods for measuring the aerodynamic and acoustic performance characteristics and energy consumption of assembled exhaust ventilation system packages for a single dwelling. If a component of the package is not physically linked to the others (e.g. air inlets), then it is assumed to have been tested according to the test method related to this component. An example of a typical exhaust package is given in Figure 2. The object of this European Standard is to provide tested characteristics for a ventilation system package in worst case conditions. It is assumed that better values are achieved on site when the ventilation system package is installed in accordance with the manufacturer's instruction and within the limits of the test conditions given in this standard. Safety requirements are given in EN 60335-2-80. Key 1 fan unit 2 roof/wall outlet 3 duct for roof/wall outlet 4 static extraction range hood or exhaust air terminal device (kitchen) 5 duct for range hood 6 exhaust air terminal device (bathroom) 7 duct for extract air from 6 8 exhaust air terminal device (toilets) 9 duct for extract air from 8 10 sound attenuators 11 controls 12 set of air inlets Figure 2 — Example of system package: exhaust ventilation system package 8 EN 13141-6:2014 (E) NOTE In Figure 2, ducts, outlets, fan, exhaust air terminal devices, sound attenuators, etc. are presented assembled but they are normally sold disassembled in a single package. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12792:2003, Ventilation for buildings - Symbols, terminology and graphical symbols EN 13141-4, Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 4: Fans used in residential ventilation systems EN 13141-7:2010, Ventilation for buildings - Performance testing of components/products for residential ventilation - Part 7: Performance testing of a mechanical supply and exhaust ventilation units (including heat recovery) for mechanical ventilation systems intended for single family dwellings EN 60704-2-13, Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-13: Particular requirements for range hoods EN ISO 3741, Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms (ISO 3741) EN ISO 3743-1, Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Engineering methods for small movable sources in reverberant fields - Part 1: Comparison method for a hard-walled test room (ISO 3743-1) EN ISO 3743-2, Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special reverberation test rooms (ISO 3743-2) EN ISO 3744, Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Engineering methods for an essentially free field over a reflecting plane (ISO 3744) EN ISO 3745, Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms (ISO 3745) 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 5167-2, Measurement of fluid flow by means of pressure differential devices inserted in circular cross­ section conduits running full - Part 2: Orifice plates (ISO 5167-2) EN ISO 5167-3, Measurement of fluid flow by means of pressure differential devices inserted in circular cross­ section conduits running full - Part 3: Nozzles and Venturi nozzles (ISO 5167-3) EN ISO 5167-4, Measurement of fluid flow by means of pressure differential devices inserted in circular cross­ section conduits running full - Part 4: Venturi tubes (ISO 5167-4) EN ISO 5801, Industrial fans - Performance testing using standardized airways (ISO 5801) EN I SO 9614-1, Acoustics - Determination of sound power levels of noise sources using sound intensity - Part 1: Measurement at discrete points (ISO 9614-1) 9 EN 13141-6:2014 (E) EN ISO 9614-2, Acoustics - Determination of sound power levels of noise sources using sound intensity - Part 2: Measurement by scanning (ISO 9614-2) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12792:2003 and the following apply. 3.1 ventilation system package (for a single dwelling) combination of compatible components designed as a single product to obtain a full residential ventilation system when installed as specified by the manufacturer Note 1 to entry It may exclude ducts and minor parts such as tapes, sealants and screws. 3.2 exhaust ventilation system package system package comprising all components necessary to realize at least the exhaust part of a ventilation system in a dwelling Note 1 to entry The following components may be part of the package: fan unit, roof/wall outlet, ducts (for roof/wall outlet, for exhaust air terminal devices), exhaust air terminal devices, range hood, controls, sound attenuators, set of externally mounted air transfer devices. 3.3 test-voltage voltage to be used for supplying the components during the testing 3.4 fan unit casing incorporating a fan and provided with spigots [SOURCE: EN 12792:2003, definition 164] 3.5 maximum air volume flow Qvmax maximum ventilation air volume flow rate measured in the worst case conditions and corresponding to the operating range declared by the manufacturer, given for standard air conditions [SOURCE: EN 12792:2003] 3.6 minimum air volume flow Qvmin minimum ventilation air volume flow rate measured in DCV packages in the worst case conditions and corresponding to the operating range declared by the manufacturer, given for standard air conditions [SOURCE: EN 12792:2003] 10 EN 13141-6:2014 (E) 3.7 demand controlled ventilation DCV method providing automatic control of air volume flow of the ventilation system dependent upon the needs of air change rates (occupancy, pollution loads, etc.) using a suitable sensor and without user intervention i.e. automatic 3.8 boosted air volume flow Qvboost air volume flow rate dedicated to the ventilation of the dwelling and to the punctual (e.g. on a very short time) removal of localized pollutants Note 1 to entry The boost function can be used in the kitchen when cooking, in the bathroom during the shower, etc. 3.9 reference configuration configuration defined for the energy efficiency calculation 3.10 short duct duct made of one elbow (where R = D) and whose length is less than or equal to 1,5 m 3.11 long duct duct made of three elbows and whose total length is at least equal to 6,5 m 3.12 collecting duct duct, in a multi family dwelling, that collects the exhaust of several exhaust systems 4 Symbols and abbreviations For the purposes of this document, the symbols and abbreviations given in EN 12792:2003 and the following apply. Symbol Designation Unit ATD Air terminal Device — DCV Demand Control Ventilation — Qv Total air volume flow rate m3/s Qvt Total air volume flow rate measured downstream the fan m3/s Qve External leakage air volume flow rate m3/s Qvmin Minimum ventilation air volume flow rate measured in the worst case conditions, with the minimum number of spigots and with the ATD at their minimum setting m3/s Qvmax Maximum ventilation air volume flow rate measured in the worst case conditions, with the maximum number of spigots and with the ATD at their maximum setting m3/s Qvboost Boosted ventilation air volume flow rate measured in the worst case conditions m3/s 11 EN 13141-6:2014 (E) and with the ATD not contributing to the boost function at their minimum setting Qvminref Minimum ventilation air volume flow rate in the reference configuration with the ATD at their minimum setting m3/s Qvmaxref Maximum ventilation air volume flow rate in the reference configuration with the ATD at their maximum setting m3/s Qvboostref Boosted ventilation air volume flow rate in the reference configuration with the ATD not contributing to the boost function at their minimum setting m3/s F min Occurrence frequency for Qvminref — F max Occurrence frequency for Qvmaxref — ^boost Occurrence frequency for Qvboostref — Pe Electric power input w ^Eminref Electric power input at qvminref w ^Emaxref Electric power input at qvmaxref w ^Eboostref Electric power input at Qvboostref w 4v Sound power level dB ^WA À-weighted sound power level dB SP/W Weighted specific power input part load W/m3/s 5 Performance testing of aerodynamic characteristics 5.1 General The following aerodynamic characteristics shall be determined: — air volume flow rate qv for each exhaust air terminal device; — total air volume flow rate ä,ë measured downstream to the fan. When a range hood is incorporated into the system, the total air volume flow rate is the sum of the exhaust air terminal devices and range hood air flow rates. When the ventilation system package allows a range of air volume flow rates, the rate being varied by means of any control device, the aerodynamic characteristics shall be determined for both minimum and maximum levels and any other intermediate levels that may be requested by the manufacturer. The air volume flow rates shall be determined for the conventional configurations specified in 5.2, giving the least favourable extract conditions for aerodynamics. 12 EN 13141-6:2014 (E) 5.2 Test installation and conditions 5.2.1 Test configuration 5.2.1.1 Test installation Tests shall be carried out with all the components which are directly linked, assembled in the configuration specified in Figure 3 according to the information provided for the package. Key 1 fan unit 2 long duct 3 long branched duct 4 exhaust air terminal device 5 flow meter 6 electrical power source NOTE One spigot is used for a branched duct (e.g. 2 spigots, 3 extractions). Figure 3 — Example of test installation 5.2.1.2 Maximum airflow test configuration A package is evaluated in the worst case conditions for the maximum setting of the intended use if: — the maximum number of spigots and the maximum number of exhaust air terminal devices are used; and — only long ducts and long branched ducts are connected to the fan unit. The air terminal devices shall be set to their maximum opening. In the case, there is more than one air terminal device connected to one spigot, the air terminal device allowing the highest air volume flow rate shall be connected to the longest duct. 13 EN 13141-6:2014 (E) When automatic control devices are supplied as part of the system, the test shall be carried out with the air terminal devices manually adjusted to the maximum required position. In case there is a boost function, qvmax doesn’t take into account the boosted air volume flow rate. 5.2.1.3 Minimum airflow test configuration A package is evaluated in the worst case conditions for the minimum setting of the intended use if: — the minimum number of air terminal devices is used; and — if only long ducts and long branched ducts are connected to the fan unit. At least, the following air terminal devices shall be connected to the fan unit: one for the kitchen and one for the bathroom. The air terminal devices shall be set, according to the manufacturer instructions, to obtain the minimum air volume flow rate. When automatic control devices are supplied as part of the system, the test shall be carried out with the air terminal devices manually adjusted to the minimum required position. 5.2.1.4 Boosted airflow test configuration The boosted air volume flow rate shall be measured in the worst case conditions if only long ducts and long branched ducts are connected to the fan unit. The air terminal devices contributing to the boost function shall be set at their boosted setting and the air terminal devices not contributing to the boosted airflow shall be set, according to the manufacturer instructions, to obtain the minimum airflow. When automatic control devices are supplied as part of the system, the test shall be carried out with the air terminal devices that don’t contribute to the boosted airflow manually adjusted to the minimum required position. 5.2.1.5 Energy efficiency test — reference configuration The configuration for this test is intended to represent the setting of the fan unit and the configuration of spigots and air terminal devices typical of an average dwelling. Only long ducts or long branched ducts are connected to the fan unit. When automatic control devices are supplied as part of the system, the air volume flow rate extracted from the dwelling for reference configuration can vary from a minimum (qVminref) to a maximum (<7vmaxref) value with the possibility of a boosted value (c/vboostref) as shown in Figure 4. When the system does not include automatic control devices, there is only one reference air volume flow rate with the possibility of a boosted value (qVboostref) as shown in Figure 5. In this case <7vminref equals to a <7vmaxref. 9vmaxref is defined as follows: air volume flow rate measured with a number of spigots and air terminal devices adjusted to achieve 70 % of 1,5 m L L = min (4,5 m ; n x d) Figure 6 — Types of ducts for connection of exhaust air terminal devices to the fan unit in aerodynamic testing Duct configurations shall be made using the components provided or specified by the manufacturer or supplier. When flexible ducts are provided or specified, they shall be extended to 90 % of their maximum length and shall be supported to prevent sagging and to maintain the specified elbow radius. The elbow may be realised by the duct itself placed in an appropriate guide. When a range hood is part of the package, it shall be placed at least 1 m above floor. Other exhaust air terminal devices may be left on the ground provided a correct orientation is provided and they are not facing the ground. 5.2.4 Test conditions 5.2.4.1 Exhaust conditions 5.2.4.1.1 Normal conditions The test shall be conducted under the following exhaust conditions: — Where the fan exhaust is connected to roof/wall outlet, the difference between the pressure upstream of the exhaust air terminal devices and the pressure downstream the roof/wall outlet shall be (0 ± 2) Pa. NOTE This requirement is deemed to be satisfied when the exhaust air terminal devices and the roof I wall outlet are in the same room. — Where the fan exhaust is connected to a collecting duct, 3 pressure differences at the exhaust, defined by the manufacturer, shall be applied, including 0 Pa. 17 EN 13141-6:2014 (E) 5.2.4.1.2 Wind conditions To test the wind effect, a counter-pressure of + 20 Pa at the exhaust shall be added: — to the normal conditions for connection to roof/wall outlet; — to the highest value for connection to a collecting duct. Only the total exhaust air volume flow rate qvt at the fan unit outlet shall be measured. 5.2.4.2 Temperature The temperature of the test room shall be maintained at 20 °Ñ ± 5 °Ñ. During the test, this temperature shall not vary by more than ± 2 °Ñ. 5.2.4.3 Electrical conditions When a single value is assigned by the manufacturer as rated voltage, this shall be the test voltage. Where a voltage range is assigned to the product by the manufacturer that includes 230 VAC, the test voltage shall be 230 VAC. This voltage shall be maintained to ± 1 % throughout the testing. 5.3 Test procedure Airflow measurements, shall be in accordance with EN ISO 5167-1, EN ISO 5167-2, EN ISO 5167-3 and EN ISO 5167-4. Other measurement devices may be used if allowing measurements of equivalent uncertainty. The measurement device pressure drop shall be compensated so as to restore the "normal condition" specified in 5.2.4.1.1 (see Annex A for an example of compensating mounting). The volume flow rate shall be measured with an uncertainty lower than: 0,3 + 0,03 x (measured value) (l • s 1) 5.4 Presentation of results The test configurations and conditions shall be clearly described in a report. Aerodynamics characteristics shall be presented in accordance with Table 1. 18 EN 13141-6:2014 (E) Table 1 — Presentation of the aerodynamic characteristics Extract condition Air flow rate qv Minimum airflow test configuration Maximum airflow test configuration Maximum boosted airflow test configuration Other control setting Minimum airflow reference configuration b Maximum airflow reference configuration Boosted airflow reference configuration Configuratio n Kitchen Bath 1 Toilet 1 Bath 2 Toilet 2 etc. Fan unit a Total air volume flow rate, qvi, measured downstream the fan. In case of automatic control devices. In case of the presence of a boosted function on the system. 6 Performance testing of external leakages The external leakage test shall be carried out by connecting an adjustable fan to the exhaust air side of the tested fan unit as shown in Figure 7. The static pressure tapping is located on a blanking off plate and the tap is connected to a pressure measuring instrument. The external leakage flow rates at under pressure in the casing are established with suitable airflow measuring equipment. The accuracy of the measured values shall be kept within ± 5 % for the flow rates and ± 3 % for the static pressures of the casing. 19 EN 13141-6:2014 (E) Key 1 adjustable fan 2 air flow measuring equipment 3 fan unit 4 static pressure measuring equipment Figure 7 — External leakage test configuration Pressure method applies to classify leakages by using Table 2. Table 2 — Leakage classification — Pressure method Class External leakage (at 250 Pa) % A1 <2 A2 <5 A3 < 10 not classified > 10 The external leakage shall be measured according to EN 13141-7:2010, Annex B. The external leakage air volume flow qve at under pressure of 250 Pa, according to Table 2, shall be reported as such and also compared to the maximum air volume flow