EN 12152:2023/prA1

• Abstract:

  This document specifies requirements and classification of air permeability of both fixed and openable parts of curtain walling, under positive and negative static air pressure.; This document applies to curtain walling as specified in EN 13830.; NOTE This version of EN 12152:2023 will supersede EN 12152:2002. Existing test results according to EN 12152:2002 could be considered still valid compared with this version of EN 12152.

• Status: Not Published
• Publication Date: 16-Aug-2028
• ICS: 91.060.10 - Walls. Partitions. Facades
• Technical Committee: CEN/TC 33 - Doors, windows, shutters and building hardware
• Drafting Committee: CEN/TC 33/WG 6 - Curtain walling
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 03-Sep-2026
• Due Date: 06-May-2027
• Completion Date: 03-Sep-2026
• Ref Project: SIST EN 12152:2023/oprA1:2026 - Curtain walling - Air permeability - Performance requirements and classification

• Amends: EN 12152:2023 - Curtain walling - Air permeability - Performance requirements and classification
• Effective Date: 17-Jun-2026

EN 12152:2023/prA1 is a CEN draft amendment to the curtain walling air permeability standard EN 12152:2023. It revises the way air permeability is defined, tested and classified for fixed and openable parts of curtain walling under positive and negative static air pressure. The document is intended for use with curtain walling covered by EN 13830.

What does EN 12152:2023/prA1 specify?

EN 12152:2023/prA1 specifies amendments to the air permeability requirements and classification for curtain walling. It keeps the focus on fixed and openable parts, and it aligns the wording around how test results are related to area, joint length and pressure.

The document applies to curtain walling as specified in EN 13830. The amendment is organized as a short set of modification clauses, preceded by a European foreword.

• European foreword
• Clause 1 - modifications to 3.4, air permeability
• Clause 2 - modifications to 3.5, fixed joint
• Clause 3 - modifications to 3.7, openable joint
• Clause 4 - modifications to Clause 5, Requirements
• Clause 5 - modification to the key of Figure 1
• Clause 6 - modifications to Clause 7, Classification
• Clause 7 - modification to the key of Figure 3
• Clause 8 - modification to the title of Figure 3

What are the key requirements of EN 12152:2023/prA1?

EN 12152:2023/prA1 mainly clarifies how air permeability is expressed, how joints are separated between fixed and openable parts, and how classification is read. In practice, this affects how specimens are prepared, how test results are reported, and how performance classes are claimed.

Air permeability expression

Clause 3.4 revises the note on air permeability so the flow rate is understood as a volume rate in cubic metres per hour related either to the overall area of the curtain walling or to the metre length of fixed joint. For users, that means the report has to state the basis of the result clearly, because the same test can be expressed in two different ways.

Fixed and openable joints

Clause 3.5 redefines a fixed joint as all joints except the joints of openable parts. Clause 3.7 defines openable joints as the joints of openable parts, including moving casement or sash joints in accordance with EN 12207 and the glazing/infill joints of openable elements. In practice, this separates leakage paths that belong to the fixed wall from those that belong to the opening elements.

Requirements for testing

Clause 5 states that air permeability for the fixed areas of curtain walling shall not count air passing through joints of openable parts. It also links classification to both positive and negative test pressures, using overall area or fixed joint length as the reference. For laboratories and manufacturers, this means the fixed-part test and the openable-part joints must be treated consistently.

Classification

Clause 7 updates the classification wording, including the exceptional category. The text ties that category to performance at the maximum test pressure and across the full range of specified pressure steps. In practice, a one-off result is not enough - the performance has to hold across the stated pressure sequence.

Figure keys and joint separation

The amendment also corrects the key of Figure 1 and revises Figure 3 and its title. Figure 3 identifies fixed joints, openable joints according to EN 12207, and glazing/infill joints of openable elements, which are taped during fixed-joint tests. That matters because the figure tells users exactly which seals are included in each test condition.

What terms does EN 12152:2023/prA1 define?

• Air permeability - the rate of air passage through curtain walling, expressed as a volume rate related to area or fixed joint length.
• Fixed joint - all joints other than the joints of openable parts.
• Openable joint - the joints of openable parts, including moving casement or sash joints and the glazing/infill joints of openable elements.
• Overall area - the total area used as the reference when air permeability is related to the full curtain walling specimen.
• Openable parts - the moving parts of the curtain walling that are tested separately from the fixed areas.

Who uses EN 12152:2023/prA1?

EN 12152:2023/prA1 is used by people working on curtain walling and façade performance. That typically includes designers, manufacturers, testing laboratories, quality managers, and buyers who need to compare air permeability results and class claims. It is also useful for specifiers and project teams that have to define how curtain walling is to be tested and reported.

What changed in EN 12152:2023/prA1 from the previous edition?

EN 12152:2023/prA1 modifies EN 12152:2023 in these stated ways:

• Clause 3.4: the note on air permeability is rewritten
• Clause 3.5: the definition of fixed joint is replaced
• Clause 3.7: the term and definition of openable joint are replaced
• Clause 5: the requirements text is replaced
• Figure 1: the key for Y2 is corrected
• Clause 7: the classification text is revised
• Figure 3: the key is replaced
• Figure 3: the title is changed

The amendment text also states that the former EN 12152:2002 is superseded by the EN 12152:2023 version, and that existing test results according to EN 12152:2002 could still be considered valid against that version.

Which standards are used with EN 12152:2023/prA1?

• EN 13830 - identifies the curtain walling products to which this document applies.
• EN 12207 - provides the basis for the moving casement or sash joints referenced in the definition of openable joints.

These references matter because EN 12152:2023/prA1 is used with a defined product family and with an external joint definition for openable elements.

What does the EN 12152:2023/prA1 document contain?

The document contains the European foreword and eight short modification clauses. Its technical content updates definitions in Clause 3, requirements in Clause 5, and classification in Clause 7, and it revises the keys and title of Figures 1 and 3. Where class limits and pressure steps are involved, the document points readers to Tables 1 and 2 and uses Figure 3 to separate fixed joints from openable-part joints for testing and reporting.

SLOVENSKI STANDARD
01-november-2026
Obešene fasade - Prepustnost zraka - Zahteve in klasifikacija - Dopolnilo A1
Curtain walling - Air permeability - Performance requirements and classification
Vorhangfassaden - Luftdurchlässigkeit - Leistungsanforderungen und Klassifizierung
Façades rideaux - Perméabilité à l'air - Exigences de performance et classification
Ta slovenski standard je istoveten z: EN 12152:2023/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 12152:2023
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
September 2026
ICS 91.060.10
English Version
Curtain walling - Air permeability - Performance
requirements and classification
Façades rideaux - Perméabilité à l'air - Exigences de Vorhangfassaden - Luftdurchlässigkeit -
performance et classification Leistungsanforderungen und Klassifizierung
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 12152:2023. 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 12152:2023/prA1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modifications to 3.4, air permeability . 4
2 Modifications to 3.5, fixed joint . 4
3 Modifications to 3.7, openable joint . 4
4 Modifications to Clause 5, Requirements . 4
5 Modification to key of Figure 1 . 4
6 Modification to Clause 7, Classif
...