SIST EN 1886:2025
(Main)Ventilation for buildings - Air handling units - Mechanical performance
Ventilation for buildings - Air handling units - Mechanical performance
This document specifies laboratory test methods, test requirements and classifications for the casings of non-residential air handling units (AHU). For the leakage tests, a method for on-site testing is also included.
The test methods and requirements are applicable to both model boxes and real units, except for the thermal and acoustic performance of the casing.
The test method for the thermal performance of the casing is applicable to the comparison of different casing constructions, but not for the calculation of thermal losses through casing or the risk of condensation.
The test method for the acoustic performance of the casing is applicable for the comparison of different constructions, but not for the provision of accurate acoustic data for specific units.
This document is not applicable for fan-coil units and similar products.
The filter bypass test specified in this document is not applicable to high efficiency particulate air (HEPA) filter installations.
Lüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Mechanische Eigenschaften und Messverfahren
Dieses Dokument legt Laborprüfverfahren, Prüfanforderungen und Klassifikationen für die Gehäuse von raumlufttechnischen Geräten (RLT Geräte) für Nichtwohngebäude fest. Für die Dichtheitsprüfungen ist auch ein Verfahren für die Prüfung vor Ort vorgesehen.
Die Prüfverfahren und Anforderungen gelten sowohl für Modelboxen als auch reale Geräte, mit Ausnahme der thermischen und akustischen Eigenschaften des Gehäuses.
Das Prüfverfahren für die thermische Leistung des Gehäuses darf für den Vergleich verschiedener Gehäusekonstruktionen verwendet werden, jedoch nicht, um Wärmeverluste durch das Gehäuse oder das Risiko der Kondensation zu berechnen.
Das Prüfverfahren für die akustische Leistung des Gehäuses darf nur verwendet werden, um verschiedene Produkte zu vergleichen, aber nicht, um genaue akustische Daten für bestimmte Geräteeinheiten herzuleiten.
Dieses Dokument gilt nicht für Ventilatorkonvektoren und ähnliche Produkte.
Die in diesem Dokument festgelegte Filter-Bypass-Prüfung gilt nicht für Anlagen mit hocheffizienten Schwebstofffiltern (HEPA).
Ventilation des bâtiments - Caissons de traitement d'air - Performances mécaniques
Le présent document spécifie les méthodes d'essai en laboratoire, les exigences d'essai et les classifications pour les enveloppes des centrales de traitement d’air (CTA) non résidentiels. Pour les essais de fuite, une méthode d'essai sur site est également incluse.
Les méthodes d'essai et les exigences sont applicables à la fois aux caissons modèles et aux unités réelles, à l'exception des performances thermiques et acoustiques de l'enveloppe.
La méthode d'essai pour les performances thermiques de l’enveloppe est applicable à la comparaison de différentes constructions d’enveloppes, mais pas pour le calcul des pertes thermiques à travers l'enveloppe ou le risque de condensation.
La méthode d'essai pour les performances acoustiques de l'enveloppe est applicable pour la comparaison de différentes constructions, mais pas pour fournir des données acoustiques précises pour des unités spécifiques.
Le présent document ne s’applique pas aux ventilo-convecteurs ni aux produits similaires.
L’essai de dérivation du filtre spécifié dans le présent document ne s’applique pas aux installations de filtre à air à très haute efficacité (HEPA).
Prezračevanje stavb - Centralne enote - Mehanske lastnosti in merilni postopki
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Nadomešča:
SIST EN 1886:2008
Prezračevanje stavb - Centralne enote - Mehanske lastnosti in merilni postopki
Ventilation for buildings - Air handling units - Mechanical performance
Lüftung von Gebäuden - Zentrale raumlufttechnische Geräte - Mechanische
Eigenschaften und Messverfahren
Ventilation des bâtiments - Caissons de traitement d'air - Performances mécaniques
Ta slovenski standard je istoveten z: EN 1886:2025
ICS:
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 1886
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN 1886:2007
English Version
Ventilation for buildings - Air handling units - Mechanical
performance
Ventilation des bâtiments - Centrales de traitement Lüftung von Gebäuden - Zentrale raumlufttechnische
d'air - Performances mécaniques Geräte - Mechanische Eigenschaften und
Messverfahren
This European Standard was approved by CEN on 21 April 2025.
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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1886:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Requirements for the model box . 9
4.1 General requirements . 9
4.1.1 General . 9
4.1.2 Model box with section joint . 9
4.1.3 Model box without section joint . 10
4.2 Reference to real unit or model box in classification . 10
5 Mechanical strength of casing . 11
5.1 General testing procedure . 11
5.1.1 General . 11
5.1.2 Classification of maximum pressure . 12
5.2 Casing strength classification . 13
5.3 Test preparation . 14
5.4 Test procedure . 18
6 External casing air leakage . 21
6.1 Requirements and classification . 21
6.1.1 General . 21
6.1.2 Laboratory testing . 22
6.1.3 Site testing of units operating under both negative and positive pressure . 22
6.2 Testing . 22
6.2.1 Test apparatus . 22
6.2.2 Preparation for test . 24
6.2.3 Test procedure . 24
6.2.4 Determination of allowable leakage rates . 25
7 Filter bypass leakage . 25
7.1 Requirements . 25
7.1.1 General . 25
7.1.2 Acceptable filter bypass leakage rates . 25
7.1.3 Two or more filter sections in the same unit . 26
7.2 Testing . 27
7.2.1 General . 27
7.2.2 Filter blanking plates . 27
7.2.3 Test procedure . 28
8 Thermal performance – model box . 30
8.1 General . 30
8.2 Test setup and environment . 31
8.3 Preparation of the model box . 32
8.4 Test procedure . 35
8.4.1 Thermal transmittance . 35
8.4.2 Thermal bridging factor (k ) . 35
b
8.5 Calculation . 36
8.5.1 General . 36
8.5.2 Calculation of the U-value . 36
8.5.3 Calculation of the k -value . 36
b
8.6 Classification . 37
9 Acoustic insulation of casing . 38
9.1 General . 38
9.2 Test requirements . 38
9.3 Test method . 38
9.4 Test procedure . 38
9.5 Sound power insulation procedure . 39
9.6 Uncertainty . 40
9.7 Presentation of the sound reduction . 40
Annex A (informative) Examples of arrangements of circulating fans . 41
A.1 Installation of circulating fans. 41
A.2 Four fans . 41
A.3 Six fans . 41
A.4 Eight fans . 42
Annex B (normative) Test report . 43
B.1 Test report . 43
B.1.1 Requirement for test report . 43
B.1.2 Recommendations for test report . 43
Annex C (informative) Example calculation of the relative deflection D and the AHU casing
r
class . 47
C.1 General . 47
C.2 Calculation of the non-permanent casing deflection and AHU casing class . 47
C.3 Calculation of the permanent casing deflection and AHU casing class . 49
Annex D (informative) Example of determining filter bypass leakage . 51
Annex E (informative) Internal leakage in monoblock and sectional AHUs . 52
Annex F (informative) General design advice for fire and mechanical safety . 54
F.1 General . 54
F.2 AHU materials . 54
F.3 Mechanical safety . 55
Bibliography . 56
European foreword
This document (EN 1886:2025) 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 December 2025, and conflicting national
standards shall be withdrawn at the latest by December 2025.
A
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