SIST EN 12153:2023/oprA1:2026

• Abstract:

  This document defines the method to be used to determine the air permeability of curtain walling, both its fixed and openable parts. It describes how the specimen shall be tested under positive and negative air pressure.; This document applies to any curtain walling product as defined in EN 13830.

• Status: Not Published
• Public Enquiry End Date: 19-Nov-2026
• ICS: 91.060.10 - Walls. Partitions. Facades
• Technical Committee: ISTP - Doors and windows
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 02-Oct-2026
• Due Date: 19-Feb-2027
• Ref Project: EN 12153:2023/prA1 - Curtain walling - Air permeability - Test method

• Amends: SIST EN 12153:2023 - Curtain walling - Air permeability - Test method
• Effective Date: 17-Jun-2026

SIST EN 12153:2023/oprA1:2026 is the Slovenian adoption of draft European amendment prA1 to EN 12153:2023, prepared by CEN. It updates the test method for determining the air permeability of curtain walling, including both fixed parts and openable parts. The method applies to curtain walling products as defined in EN 13830 and specifies testing under positive and negative air pressure.

What does SIST EN 12153:2023/oprA1:2026 specify?

SIST EN 12153:2023/oprA1:2026 specifies changes to the air permeability test method for curtain walling. The amendment mainly clarifies terminology, symbols, test preparation, the pressure-test sequence, and how results are expressed.

The document is organized as a European foreword followed by Clauses 1 to 12 and Figure 3. The main technical changes are concentrated in Clause 3, Clause 4, and Clause 7.

What are the key requirements of SIST EN 12153:2023/oprA1:2026?

Terms and measurement basis

Clause 3 revises the definition of openable joint length so it covers the joints of all moving casement or sash and the glazing/infill joints of openable parts. In practice, the same leakage paths are treated consistently when the openable parts are assessed.

Clause 3 also revises overall area and links it to Figure 3. This matters because the reported permeability for fixed parts is expressed per unit area, so the area reference must match the specimen layout.

Test preparation and pressure testing

Clause 7.2 and Clause 7.3.1 require all joints of openable parts to be taped airtight before the fixed-parts test. This isolates leakage through fixed joints from leakage through moving parts.

Clauses 7.3.2 and 7.3.3 keep the positive-pressure and negative-pressure tests for fixed parts, while Clause 7.3.4 covers the pressure test for openable parts. The untaped test on openable parts should not be repeated if those openable parts have already been tested and classified according to EN 1026 and EN 12207.

Reporting results

Clause 7.3.5 separates the result expression for fixed parts and joints of openable parts. The amendment keeps the results tied to airflow measurements in the test chamber and requires separate reporting for fixed parts and for the joints of openable parts.

For fixed parts, the air permeability is calculated per unit area; for openable parts, it is calculated per unit length of joints. In practice, this gives two comparable outputs for the two leakage paths and supports clear product documentation.

Figure 3 is also updated. Its key identifies the fixed joint, the openable joint according to EN 12207, and the glazing/infill joint of openable parts, which helps test staff tape the correct joints during the different test stages.

What terms does SIST EN 12153:2023/oprA1:2026 define?

• openable joint length - the total length of the joints of openable parts used for the openable-part result calculation.
• overall area - the area reference used for the fixed-parts result calculation and linked to Figure 3.
• fixed parts - the non-openable parts of the curtain walling tested separately from openable parts.
• joints of openable parts - the joints belonging to openable parts, including the openable joints and glazing/infill joints.
• Q_fc - the airflow into the test chamber measured with only the joints of openable parts sealed.
• Q_tc - the airflow into the test chamber measured with the joints of openable parts unsealed.
• L0 - the total length of the joints of openable parts.

Who uses SIST EN 12153:2023/oprA1:2026?

SIST EN 12153:2023/oprA1:2026 is used by test laboratories, curtain walling manufacturers, façade engineers, and conformity assessment bodies. Quality managers and buyers use it to understand how air permeability is measured and how test reports separate fixed parts from openable parts.

It is relevant when preparing specimens, choosing the correct taped or untaped test condition, comparing products, and documenting performance for curtain walling systems.

What changed in SIST EN 12153:2023/oprA1:2026 from the previous edition?

SIST EN 12153:2023/oprA1:2026 modifies EN 12153:2023. The stated changes are:

• revised definitions for 3.7 and 3.8
• revised symbols and abbreviations in Clause 4
• revised test preparation in 7.2
• revised general rules in 7.3.1
• revised titles and text for the positive and negative pressure tests for fixed parts
• revised title and text for the pressure test for openable parts
• revised expression of results in 7.3.5
• revised key and title for Figure 3

Which standards are used with SIST EN 12153:2023/oprA1:2026?

• EN 13830 - defines the curtain walling product family to which the test method applies.
• EN 1026 - is referenced when deciding whether the untaped openable-parts test needs to be carried out.
• EN 12207 - is referenced for the openable joint definition and for prior testing/classification of openable parts.

What does the SIST EN 12153:2023/oprA1:2026 document contain?

The document contains revised definitions, updated symbols, and the amended test procedure for air permeability of curtain walling. It shows how to prepare the specimen, how to tape or untape the joints of openable parts, and how to run the positive and negative pressure tests.

It also contains the result-expression section that separates fixed parts from openable parts and instructs the reader to plot results against test pressure. Figure 3 provides the joint arrangement used during testing and reporting.

SLOVENSKI STANDARD
01-november-2026
Obešene fasade - Prepustnost zraka - Preskusna metoda - Dopolnilo A1
Curtain walling - Air permeability - Test method
Vorhangfassaden - Luftdurchlässigkeit - Prüfverfahren
Façades rideaux - Perméabilité à l'air - Méthode d'essai
Ta slovenski standard je istoveten z: EN 12153:2023/prA1
ICS:
91.060.10 Stene. Predelne stene. Walls. Partitions. Facades
Fasade
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 12153:2023
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
September 2026
ICS 91.060.10
English Version
Curtain walling - Air permeability - Test method
Façades rideaux - Perméabilité à l'air - Méthode d'essai Vorhangfassaden - Luftdurchlässigkeit - Prüfverfahren
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 33.

This draft amendment A1, if approved, will modify the European Standard EN 12153:2023. If this draft becomes an amendment,
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration.

This draft amendment 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12153:2023/prA1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modification to 3.7, openable joint length . 4
2 Modifications to 3.8, overall area . 4
3 Modifications to Clause 4, Symbols and abbreviations . 4
4 Modification to 7.2, Test preparation . 4
5 Modification to 7.3.1, General . 4
6 Modification to title of 7.3.2, Positive pressure test: fixed elements . 4
7 Modification to title of 7.3.3, Negative pressure test: fixed elements . 4
8 Modification to title of 7.3.4, Pressure test: openable elements . 5
9 Modification to 7.3.4, Pressure test: openable elements . 5
10 Modifications to 7.3.5, Expression of results . 5
11 Modification to key of Figure 3 . 6
12 Modification to title of Figure 3 . 6
European foreword
This document (EN 12153:2023/prA1:2026) has been prepared by Technical Committee CEN/TC 33
“Doors, windows, shutters, building hardware and curtain walling”, the secretariat of which is held by
AFNOR.
This document is currently submitted to the CEN Enquiry.
In comparison with EN 12153:2023, the following modification has been made:
— Clause 3, terms and definitions 3.7 “openable joint length” and 3.8 “overall area” modified;
— Clause 4 “Symbols and abbreviation” modified;
— Clause 7.2 “Test preparation” modified;
— Clause 7.3.1 “General” modified;
— Clause 7.3.2 “Positive pressure test: fixed ele
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