Ventilation for buildings - Air handling units - Rating and performance for units, components and sections

This European Standard specifies requirements and testing for ratings and performance of air handling units as a whole. It also specifies requirements, recommendations, classification, and testing of specific components and sections of air handling units. For many components and sections it refers to component standards, but it also specifies restrictions or applications of standards developed for stand alone components.
This standard is applicable both to standardised designs, which may be in a range of sizes having common construction concepts, and also to custom-design units. It also applies both to air handling units, which are completely prefabricated, and to units which are built up on site. Generally the units within the scope of this standard include at least a fan, a heat exchanger and an air filter.
This standard is not applicable to the following:
a)   air conditioning units serving a limited area in a building, such as fan coil units;
b)   units for residential buildings;
c)   units producing ventilation air mainly for a manufacturing process.

Lüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Leistungskenndaten für Geräte, Komponenten und Baueinheiten

Die vorliegende Europäische Norm legt Anforderungen für zentrale raumlufttechnische Geräte (RLT-Geräte) als Gesamtheit fest und schreibt die Prüfung der Leistungskenndaten vor. Sie gibt Empfehlungen und legt Anforderungen, Klassifizierung und Prüfung für spezielle Komponenten und Baueinheiten von RLT-Geräten fest. Bei vielen Komponenten und Baueinheiten wird auf spezielle Produktnormen verwiesen; es werden jedoch auch Einschränkungen bzw. Anwendungen für Normen festgelegt, die für spezielle Produkte erarbeitet wurden.
Diese Norm ist sowohl auf Standardkonstruktionen, die Bestandteil einer Baureihe mit gemeinsamen Konstruktionsmerkmalen sein können, als auch auf kundenspezifisch ausgelegte Geräte anwendbar. Sie gilt sowohl für vollständig vorgefertigte RLT-Geräte als auch für solche, die vor Ort aufgebaut werden. Die im Anwendungsbereich dieser Norm liegenden RLT-Geräte weisen mindestens einen Ventilator, einen Wärmeaustauscher und einen Luftfilter auf.
Die Norm ist auf folgende Fälle nicht anwendbar:
a)   raumlufttechnische Geräte, die nur einen begrenzten Bereich in einem Gebäude versorgen, z. B. Ventilatorkonvektoren;
b)   Geräte zur Wohnungslüftung;
c)   Geräte, die Zuluft überwiegend zu Produktionszwecken liefern.

Ventilation des bâtiments - Caissons de traitement d'air - Classification et performance des unités, composants et sections

La présente norme européenne spécifie les prescriptions et les essais pour la classification et la performance des
caissons de traitement d'air pris dans leur ensemble. Elle spécifie également les exigences, les recommandations,
la classification et l'essai des composants et sections spécifiques des caissons de traitement d'air. Pour un grand
nombre de composants et de sections, elle se réfère aux normes de composants, mais elle spécifie également les
restrictions concernant l'application des normes mises au point pour les composants individuels.
La présente norme s'applique aux caissons de conception normalisée, qui peuvent être dans une plage de
dimensions ayant des concepts communs de construction, et également aux caissons de conception spécifique.
Elle s'applique aussi aux caissons de traitement d'air entièrement préfabriqués et aux caissons construits sur site.
En règle générale, les caissons qui s'inscrivent dans le cadre de la présente norme comprennent au moins un
ventilateur, un échangeur de chaleur et un filtre à air.
La présente norme n’est pas applicable aux équipements suivants :
a) caissons de climatisation desservant une aire limitée dans un bâtiment, tels que les ventilo-convecteurs ;
b) caissons pour systèmes de ventilation d'immeubles résidentiels ;
c) caissons produisant de l'air de ventilation, principalement pour un procédé de fabrication.

Prezračevanje stavb - Klimati - Ocenitev in lastnosti klimatov, sestavnih delov in sekcij

Ta evropski standard določa zahteve in preskušanje za ocenitev in lastnosti klimatov kot celote. Določa tudi zahteve, priporočila, klasifikacijo in preskušanje za specifične sestavne dele in sekcije klimatov. Pri številnih sestavnih delih in sekcijah se sklicuje na standarde za sestavne dele, določa pa tudi omejitve ali uporabo standardov, razvitih za samostojne sestavne dele. Ta standard velja za standardizirane zasnove, ki so lahko različnih velikosti in imajo skupne konstrukcijske koncepte, in za klimate, narejene po meri. Velja tudi za gotove klimate in klimate, ki se postavijo na kraju samem. V splošnem klimati, ki spadajo v obseg uporabe tega standarda, vključujejo vsaj ventilator, izmenjevalnik toplote in zračni filter. Ta standard ne velja za naslednje: a) klimate, ki delujejo v omejenem območju v stavbi, kot so naprave z ventilatorjem; b) klimate za stanovanjske stavbe; c) klimate, ki proizvajajo zrak za prezračevanje v glavnem za proizvodni proces.

General Information

Status
Withdrawn
Publication Date
18-Sep-2011
Withdrawal Date
05-Jan-2020
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
30-Dec-2019
Due Date
22-Jan-2020
Completion Date
06-Jan-2020

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VHNFLMLüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Leistungskenndaten für Geräte, Komponenten und BaueinheitenVentilation des bâtiments - Caissons de traitement d'air - Classification et performance des unités, composants et sectionsVentilation for buildings - Air handling units - Rating and performance for units, components and sections91.140.30VLVWHPLVentilation and air-conditioningICS:Ta slovenski standard je istoveten z:EN 13053:2006+A1:2011SIST EN 13053:2007+A1:2011en,fr,de01-oktober-2011SIST EN 13053:2007+A1:2011SLOVENSKI

STANDARD
SIST EN 13053:2007+A1:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13053:2006+A1
July 2011 ICS 91.140.30 Supersedes EN 13053:2006English Version

Ventilation for buildings - Air handling units - Rating and performance for units, components and sections

Ventilation des bâtiments - Caissons de traitement d'air - Classification et performance des unités, composants et sections

Lüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Leistungskenndaten für Geräte, Komponenten und Baueinheiten This European Standard was approved by CEN on 26 June 2006 and includes Amendment 1 approved by CEN on 19 May 2011.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13053:2006+A1:2011: ESIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 2 Contents Page Foreword ................................................................................................................................................. 41Scope.......................................................................................................................................... 62Normative references ............................................................................................................... 63Terms and definitions ............................................................................................................... 84Symbols and abbreviations ................................................................................................... 105Ratings and performance of the entire air handling unit .................................................... 135.1General ..................................................................................................................................... 135.2Testing of aerodynamic performance ................................................................................... 135.2.1Characteristics and quantities ............................................................................................... 135.2.2Test method ............................................................................................................................. 155.2.3Measurement procedure ........................................................................................................ 155.2.4Evaluation of results ............................................................................................................... 175.3Testing of acoustic performance .......................................................................................... 175.3.1General ..................................................................................................................................... 175.3.2Specific requirements concerning the set-up of acoustic tests ........................................ 185.4Tolerances ............................................................................................................................... 225.5Test report ............................................................................................................................... 236Ratings and performance of the entire air handling unit .................................................... 266.1General ..................................................................................................................................... 266.2Casing ...................................................................................................................................... 266.3Fan section .............................................................................................................................. 286.3.1General ..................................................................................................................................... 286.3.2!!!!Power input of fans"""" ...................................................................................................... 296.4Coils.......................................................................................................................................... 306.4.1General ..................................................................................................................................... 306.4.2Testing...................................................................................................................................... 306.4.3Construction ............................................................................................................................ 306.4.4Cooler/Droplet Eliminator....................................................................................................... 306.5Heat recovery sections ........................................................................................................... 316.5.1General ..................................................................................................................................... 316.5.2Classifications and requirements ......................................................................................... 316.5.3Testing...................................................................................................................................... 346.6Damper sections ..................................................................................................................... 346.6.1General ..................................................................................................................................... 346.6.2Requirements and testing ...................................................................................................... 346.7Mixing sections ....................................................................................................................... 346.7.1General ..................................................................................................................................... 346.7.2Categories and characteristics .............................................................................................. 356.7.3Requirements .......................................................................................................................... 356.7.4Measurements ......................................................................................................................... 376.7.5Field testing of mixing efficiency .......................................................................................... 386.8Humidifiers .............................................................................................................................. 386.8.1General ..................................................................................................................................... 386.8.2Categories ................................................................................................................................ 396.8.3Requirements .......................................................................................................................... 396.9Filter sections .......................................................................................................................... 416.9.1General requirements ............................................................................................................. 416.9.2Filters installed in air handling units .................................................................................... 426.10Passive sound attenuation sections ..................................................................................... 437Extended hygiene requirements for special applications .................................................. 43SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 3 7.1General ..................................................................................................................................... 437.2Accessibility ............................................................................................................................ 437.3Smoothness ............................................................................................................................. 437.4Inspection windows and lights .............................................................................................. 447.5Drainage/prevention of condensation, humidifiers ............................................................. 447.6Air leakage ............................................................................................................................... 448Instructions for installation, operation and maintenance ................................................... 448.1Installation ............................................................................................................................... 448.2Operation and maintenance ................................................................................................... 448.3Documentation and labelling ................................................................................................. 45Annex A (informative) Air handling units - Heat recovery – Defrosting - Requirements and testing....................................................................................................................................... 46A.1General ..................................................................................................................................... 46A.2Defrosting ................................................................................................................................ 46A.2.1Defrosting heat factor ............................................................................................................. 46A.2.2Non-cyclic defrosting ............................................................................................................. 46A.2.3Cyclic defrosting ..................................................................................................................... 46A.3Testing...................................................................................................................................... 47A.3.1Test rig ..................................................................................................................................... 47A.3.2Duty points .............................................................................................................................. 48A.3.3Test procedures ...................................................................................................................... 48A.3.4Testing of defrosting heat factor ........................................................................................... 48A.3.5Total measuring time .............................................................................................................. 48A.4Test report ............................................................................................................................... 49A.4.1The heat recovery device ....................................................................................................... 49A.4.2The defrosting heat factor ...................................................................................................... 49Annex B (informative)

!!!!Air handling units – Heat recovery – Characteristics"""" .................... 50B.1Efficiency of the heat recovery .............................................................................................. 50B.2Evaluation ................................................................................................................................ 52B.3Evaluation of auxiliary energies ............................................................................................ 52B.4Further characteristics ........................................................................................................... 52B.5Efficiency ................................................................................................................................. 53B.6View of yearly energy ............................................................................................................. 53Bibliography ......................................................................................................................................... 54 SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 4 Foreword This document (EN 13053:2006+A1:2011) 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 January 2012, and conflicting national standards shall be withdrawn at the latest by January 2012. 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 13053:2006". This document includes Amendment 1, approved by CEN on 2011-05-19. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". This European Standard is a part of a series of standards for air handling units used for ventilation and air conditioning of buildings for human occupancy. It considers the ratings and the performance of air handling units as a whole, the requirements and performance of specific components and sections of air handling units including hygiene requirements. The position of this standard in the field of mechanical building services is shown in Figure 1. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

SIST EN 13053:2007+A1:2011
EN 13053:2006+A1:2011 (E) 5

Figure 1 — Position of this standard in the field of mechanical building services SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 6 1 Scope This European Standard specifies requirements and testing for ratings and performance of air handling units as a whole. It also specifies requirements, recommendations, classification, and testing of specific components and sections of air handling units. For many components and sections it refers to component standards, but it also specifies restrictions or applications of standards developed for stand alone components. This standard is applicable both to standardised designs, which may be in a range of sizes having common construction concepts, and also to custom-design units. It also applies both to air handling units, which are completely prefabricated, and to units which are built up on site. Generally the units within the scope of this standard include at least a fan, a heat exchanger and an air filter. This standard is not applicable to the following: a) air conditioning units serving a limited area in a building, such as fan coil units; b) units for residential buildings; c) units producing ventilation air mainly for a manufacturing process. 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 308, Heat exchangers — Test procedures for establishing performance of air to air and flue gases heat recovery devices EN 779, Particulate air filters for general ventilation — Determination of the filtration performance EN 1216, Heat exchangers — Forced circulation air-cooling and air-heating coils — Test procedures for establishing the performance EN 1751, Ventilation for buildings — Air terminal devices — Aerodynamic testing of dampers and valves EN 1886:1998, Ventilation for buildings — Air handling units — Mechanical performance EN 12792:2003, Ventilation for buildings — Symbols, terminology and graphical symbols EN 13779, Ventilation for non-residential buildings — Performance requirements for ventilation and room-conditioning systems EN ISO 3741, Acoustics — Determination of sound power levels of noise sources using sound pressure — Precision methods for reverberation rooms (ISO 3741:1999) EN ISO 3744, Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994) EN ISO 3746, Acoustics — Determination of sound power levels of noise sources using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane

(ISO 3746:1995) EN ISO 5136, Acoustics — Determination of sound power radiated into a duct by fans and other air-moving devices — In-duct method (ISO 5136:2003) SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 7 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 5167-1:2003) EN ISO 7235, Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units — Insertion loss, flow noise and total pressure loss (ISO 7235:2003) ISO 5221, Air distribution and air diffusion — Rules to methods of measuring air flow rate in an air-handling duct ISO 5801:1997, Industrial fans — Performance testing using standardized airways !ISO 13348", Industrial Fans — tolerances, methods of conversion and technical data presentation

SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 8 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 12792:2003 and the following apply. 3.1 air handling unit factory made encased assembly consisting of sections containing a fan or fans and other necessary equipment to perform one or more of the following functions: circulating, filtrating, heating, cooling, heat recovery, humidifying, dehumidifying and mixing air 3.2 section of air handling unit functional element of an air handling unit consisting of one or more components in a single casing 3.3 component of air handling unit smallest functional element of an air handling unit 3.4 blow-through unit air handling unit with a section or sections downstream of the supply air fan 3.5 casing of an air-handling unit enclosure of the unit, within which the components are mounted 3.6 openings for outdoor air, supply air, extract air, recirculation air and exhaust air aperture through which air is taken in or discharged from the air handling unit, such as openings for outdoor air, supply air, recirculation air and exhaust air 3.7 damper section section of air handling unit including a damper or valve 3.8 mixing section section where e.g. outdoor air flow and the recirculation air flow are mixed in a controlled way. The section generally consists of one damper per air flow and a mixing chamber 3.9 filter section section including a filter or filters and an associated filterframe 3.10 heat recovery section section in which heat (and possibly also moisture) is transferred from one airstream into another, either directly or using an intermediary heat transfer medium 3.11 air heating and cooling coils heat exchangers by means of which heat is transferred from a heat transfer medium to air (heating coil) or the other way round (cooling coil) 3.12 sound attenuation section section in which sound transfer into a ductwork or into ambient air is reduced SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 9 3.13 humidifier section section in which moisture is added to the air 3.14 fan section section in which one or more fans are installed for moving air 3.15 combined section section within which two or more

functions are combined 3.16 functions

3.16.1 air treatment process by which the state of the air is modified with respect to one or more of its characteristics such as temperature, moisture content, dust content, bacterial count, gas and vapour content 3.16.2 air type designation of air moving through a ventilation, air conditioning or air treatment installation as a function of its location relative to the installation, e.g. outdoor air, exhaust air, extract air etc 3.16.3 cooling removal of

latent and/or sensible heat 3.16.4 dehumidification controlled reduction of water vapour from the air 3.16.5 filtration removal of particulate material from the airstream 3.16.6 heating transfer of heat from one body or medium to another medium 3.16.7 humidification controlled addition of water vapour to an air stream or space 3.16.8 sound reduction controlled reduction of sound energy 3.17 characteristics

3.17.1 air flow movement of air within set boundaries (such as ducts) 3.17.2 air flow rate mass or volume flow of air passing a given plane divided by time SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 10 3.17.3 bypass factor ratio of the diverted air flow to the sum of the main air flow and the diverted air flow 3.17.4 bypass leakage unwanted and uncontrolled passing of untreated air into the treated air between the components within a casing, such as filters and coils 3.17.5 deflection of a casing

deformation in mm of the external surfaces of the enclosure when subjected to a positive (bulging) or negative (caving) pressure. It is given as the measured difference in distance between a reference plane and the maximum point of deflection when subjected to air pressure 3.17.6 defrosting heat factor ratio between the energy transferred into the air supply and the maximum recoverable energy in exhaust air, excluding the energy input for defrosting 3.17.7 air leakage factor f air tightness expressed as the air leakage per unit envelope area and pressure difference (external air leakage) 3.17.8 air leakage rate qvl air leakage of the air handling unit, subject to air pressure (external air leakage) 3.17.9 external total pressure difference difference between the total pressure at the outlet of the air handling unit and the total pressure at the inlet 3.17.10 humidification efficiency ratio between the mass of water evaporated by the humidifier and the theoretical mass needed to achieve saturation at a given temperature 3.17.11 internal air leakage rate air leakage in between the two air streams within a section 3.17.12 thermal bridging factor kb ratio between the lowest temperature difference between any point on the external surface and the mean internal air temperature and the mean air to air temperature difference 3.17.13 thermal transmittance U heat flow per unit of area and temperature difference 4 Symbols and abbreviations For the purposes of this standard, symbols and units given in EN 12792:2003 and in Table 1 apply together with those defined by the formulae, text and annexes of this standard. SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 11 Table 1 — Symbols, terms, units and subscripts Symbol Term Unit A Surface area m2 Ac Cross sectional area of a duct m2 c Sound velocity in the air m × s-1 d Effective duct diameter m Dp Sound insertion loss dB E Duct end correction value dB f Air leakage factor l × (s × m2)-1 k Number of measurements within the total measuring time - k Filter bypass leakage factor % kb Thermal bridging factor of the casing - Lp Sound pressure level dB LW Sound power level dB LWA A-weighted sound power level dB(A) nF Rotational speed of the fan s-1 PE Electrical motor input power W pa Atmospheric pressure Pa pd Dynamic pressure Pa ps Static pressure Pa

pt Total fan pressure Pa ptu External total pressure difference of the unit Pa Qdefr Total energy input for defrosting during one complete frosting/defrosting cycle J pv

Partial pressure of water vapour Pa qmn Nominal air mass flow rate of the recovery device kg × s-1 qm Air mass flow rate kg × s-1 qv Air volume flow rate m3 × s-1 SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 12

Table 1 (continued) Symbol Term Unit qvm Measured and converted air volume flow rate m3 × s-1 qvs Specified air volume flow rate m3 × s-1 ta

Dry-bulb temperature °C tm,i

Local temperature at measurement point °C ti Mean internal air temperature °C t Tolerance range % u Uncertainty range of measured data % U Range of uniformity of flow after the mixing section - U

Thermal transmittance of the casing W × (m2 × K)-1 v

Velocity of air at a point m × s-1 x Absolute humidity g x kg-1 ∆τ Sampling interval time s ∆p1 Pressure drop on exhaust-air side Pa εD Defrosting heat ratio - ηh Humidifier efficiency - ηmix Mixing efficiency % ϕ Relative humidity % ρ Density kg × m-3 SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 13 Table 1 (concluded) Subscripts 1 Inlet 2 Outlet 11 Exhaust air in 12 Exhaust air out 21 Supply air in 22 Supply air out i Internal H Air flow with higher temperature L Air flow with lower temperature M Mixed air flow [mean temperature] tot Air flow downstream of the mixing section Abbreviations HVAC Heating, ventilation and air conditioning

5 Ratings and performance of the entire air handling unit 5.1 General The performance of the entire air handling unit cannot be defined as the sum of the individual components and sections. Hence, the procedures that follow shall be applied to a complete air handling unit. In particular, and under agreed circumstances these procedures can be applied to a part of an air handling unit. The methods described in 5.2 cover measuring air volume flow together with the external total pressure of the unit and power consumption. By selecting an appropriate test system, these procedures can be extended to include measuring the sound level transmitted from the air handling unit into the ductwork at a known volume flow, as described in 5.3. 5.2 Testing of aerodynamic performance 5.2.1 Characteristics and quantities 5.2.1.1 Characteristics a) External total pressure difference of the unit/Air volume flow - characteristic. The difference in total pressure between outlet and inlet of the air handling unit related to the air volume flow at the measurement plane. SIST EN 13053:2007+A1:2011

EN 13053:2006+A1:2011 (E) 14 b) Electrical motor input power/Air volume flow - characteristic. The power input to the fan motor related to the air volume flow. If a speed adjustment device is needed, e.g. frequency inverter, the electrical motor input power shall include the power of speed control devices. These characteristics shall be converted from the ambient temperature and pressure measured at the time of the test, to standard conditions with an air density of 1,2 kg × m-3. These characteristics shall be presented for a stated nominal fan speed but without adjustment for inherent speed deviation during the test. 5.2.1.2 Quantities a) Air volume flow rate (qv) shall be measured by any method which is in accordance with

ISO 5801, ISO 5221, EN ISO 5167-1 or ISO 3966, e.g. a nozzle, an orifice plate or a pitot-static tube. b) External total pressure difference of the unit (ptu) shall be calculated from the pressure measurements defined in 5.2.3.2 and is the difference between the total pressure at the outlet of the air handling unit and the total pressure at the inlet. The duct sizes shall be the sizes defined by the manufacturer. NOTE The external total pressure difference ptu is defined in terms of the difference in stagnation pressures between outlet and inlet, but the Mach Number applicable to an air handling unit will be sufficiently low (less than 0,15) for total pressures determined by conventional means. Hence, an external total pressure difference of the unit is: tu1tu2tuppp−= (1) where

ptu is the sum of the static pressure psu
...

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