oSIST prEN 1886:2024

SLOVENSKI STANDARD
01-julij-2024
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: prEN 1886
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2024
ICS 91.140.30 Will supersede EN 1886:2007
English Version
Ventilation for buildings - Air handling units - Mechanical
performance
Ventilation des bâtiments - Caissons de traitement Lüftung von Gebäuden - Zentrale raumlufttechnische
d'air - Performances mécaniques Geräte - Mechanische Eigenschaften und
Messverfahren
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 156.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1886:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Requirements for the model box . 7
4.1 General requirements . 7
4.2 Requirements for a model box for single casing section AHU ranges . 8
4.3 Reference to real unit or model box in classification . 8
5 Mechanical strength of casing . 8
5.1 General testing procedure . 8
5.1.1 General. 8
5.1.2 Classification of maximum pressure . 9
5.1.3 Casing strength classification . 9
5.1.4 Test preparation . 10
5.1.5 Test execution . 14
6 Casing air leakage . 16
6.1 Requirements and classification . 16
6.2 Test pressure . 17
6.2.1 General. 17
6.2.2 Site testing of units operating under both negative and positive pressure. 18
6.2.3 Laboratory testing . 18
6.3 Testing . 18
6.3.1 Test apparatus . 18
6.3.2 Preparation for test . 20
6.3.3 Test procedure . 20
6.3.4 Determination of allowable leakage rates . 21
7 Filter bypass leakage . 21
7.1 Requirements . 21
7.1.1 General. 21
7.1.2 Acceptable filter bypass leakage rates . 21
7.1.3 Two or more filter sections in the same unit . 22
7.2 Testing . 23
7.2.1 General. 23
7.2.2 Filter blanking plates . 23
7.2.3 Test procedure . 24
8 Internal leakage in bidirectional AHUs . 26
8.1 General. 26
8.2 Static internal leakage . 27
9 Thermal performance – model box . 28
9.1 General. 28
9.2 Test setup and environment . 28
9.3 Preparation of the model box . 30
9.4 Test procedure . 33
9.4.1 Thermal transmittance . 33
9.4.2 Thermal bridging factor (k ). 33
b
9.5 Calculation . 33
9.5.1 Calculation of the U-value . 33
9.5.2 Calculation of the k -value . 34
b
9.6 Classification . 35
10 Acoustic insulation of casing . 36
10.1 General . 36
10.2 Test requirements . 36
10.3 Test method . 36
10.4 Test procedure . 36
10.5 Sound power insulation procedure . 36
10.6 Uncertainty . 37
10.7 Presentation of the sound reduction . 38
11 Fire protection . 38
11.1 General . 38
11.2 Casing AHU materials . 38
11.3 Air heaters . 39
11.4 Filters, contact humidifiers and droplet eliminators of AHU's . 39
11.5 Heat recovery . 39
12 Mechanical safety . 39
Annex A (informative) Examples of arrangements of circulating fans . 40
Annex B (normative) Test report . 42
Annex C (informative) Example calculation of the deflection . 46
Annex D (informative) Example of determining filter bypass leakage . 50
Bibliography . 51

European foreword
This document (prEN 1886:2024) has been prepared by Technical Committee CEN/TC 156 “Ventilation
for buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1886:2007.
The main changes with respect to the previous edition are:
— a model box definition suitable for air handling unit ranges that are only manufactured using a single
casing without interme
...