SIST EN ISO 12759-4:2020/oprA1:2026

• Status: Not Published
• Public Enquiry End Date: 30-Apr-2026
• ICS: 23.120 - Ventilators. Fans. Air-conditioners
• Technical Committee: OGS - Heating for buildings
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 26-Feb-2026
• Due Date: 16-Jul-2026
• Completion Date: 22-Apr-2026
• Ref Project: EN ISO 12759-4:2019/prA1 - Fans - Efficiency classification for fans - Part 4: Driven fans at maximum operating speed - Amendment 1: Addition of Annex F providing an example of the use of efficiency classification and editorial changes (ISO 12759-4:2019/DAM 1:2026)

• Amends: SIST EN ISO 12759-4:2020 - Fans - Efficiency classification for fans - Part 4: Driven fans at maximum operating speed (ISO 12759-4:2019)
• Effective Date: 07-May-2025

Overview

SIST EN ISO 12759-4:2020/oprA1:2026 specifies the framework for the efficiency classification of driven fans at their maximum operating speed. Issued by CEN, this standard serves as an amendment to the foundational ISO 12759-4:2019, notably introducing Annex F, which provides a practical example for implementing efficiency classification, along with other editorial adjustments. This amendment is closely aligned with the broader ISO 12759 family, supporting industry efforts in improving energy efficiency, meeting ecodesign regulations, and harmonizing international measurement practices for fans with electric motor drives.

The amendment is directly relevant for manufacturers, designers, regulators, and other stakeholders involved in fan selection, application, and compliance with EU ecodesign requirements for fans driven by motors with an electrical input power between 125 W and 500 kW.

Key Topics

• Efficiency Classification for Fans
  The document outlines procedures for classifying the efficiency of driven fans operating at maximum speed. It clarifies which types of fans are covered, specifically those with motors of at least 0.125 kW input power. Only the fan itself is evaluated, not the complete ventilation or air handling systems in which it is installed.

• Minimum Efficiency Limits (MEL)
  A key focus is on establishing minimum energy efficiency limits for fans, which are essential for compliance with current and future ecodesign mandates in the European market. Annex F describes how these minimum limits (MELs) are determined and applied.

• Correction Factors in Efficiency Calculation
  The standard highlights the use of correction factors for various real-world operating conditions-such as power conversion, part load, and protective guards-that impact the overall fan efficiency assessment.

• Editorial and Terminological Updates
  Clarifications have been added to definitions and technical terms to align with other standards, enhancing consistency and understanding across the industry.

Applications

Implementing the guidance and requirements of SIST EN ISO 12759-4:2020/oprA1:2026 delivers significant practical value:

• Regulatory Compliance
  Helps manufacturers and importers achieve compliance with the European Commission Regulation (EU) 2024/1834 and related directives concerning energy efficiency for fans.

• Design and Product Development
  Provides engineering teams with clear criteria for designing fans that not only satisfy but can document performance for energy efficiency classifications-critical for market access in regulated sectors.

• Procurement and Specification
  Enables building services engineers and specifiers to select fans based on internationally recognized efficiency classes, optimizing operational costs and supporting corporate sustainability goals.

• Market Differentiation
  Certified fan efficiency ratings create marketing and sales advantages, as energy performance becomes a predominant selection factor for end users and building owners.

Related Standards

SIST EN ISO 12759-4:2020/oprA1:2026 is part of a suite of fan efficiency standards, including:

• ISO 12759-3: Fans - Efficiency classification for fans - Part 3: Fans without drives at maximum operating speed
• ISO 12759-5: Fans - Efficiency classification for fans - Part 5: Jet fans
• ISO 12759-6: Fans - Efficiency classification for fans - Part 6: Testing and calculation methods

Other essential referenced standards:

• ISO 5801: Provides the test methods for determining fan performance, referenced for installation categories in this document.
• ISO 13857:2019: Referenced for safety guard measurements that affect efficiency calculations.
• Commission Regulation (EU) 2024/1834: Establishes legal ecodesign requirements and efficiency thresholds.

By utilizing SIST EN ISO 12759-4:2020/oprA1:2026 in design, production, and procurement processes, organizations ensure energy-efficient, regulation-compliant solutions that address both present and future demands of the ventilation and fan industry.

SLOVENSKI STANDARD
01-april-2026
Ventilatorji - Klasifikacija učinkovitosti ventilatorjev - 4. del: Ventilatorji s pogonom
pri največji obratovalni hitrosti - Dopolnilo A1: Dodatek Priloge F, ki vsebuje
primer uporabe razvrstitve učinkovitosti in uredniške spremembe (ISO 12759-
4:2019/DAM 1:2026)
Fans - Efficiency classification for fans - Part 4: Driven fans at maximum operating speed
- Amendment 1: Addition of Annex F providing an example of the use of efficiency
classification and editorial changes (ISO 12759-4:2019/DAM 1:2026)
Ventilatoren - Effizienzklassifizierung für Ventilatoren - Teil 4: Angetriebene Ventilatoren
bei maximaler Betriebsdrehzahl (ISO 12759-4:2019/DAM 1:2026)
Ventilateurs - Classification du rendement des ventilateurs - Partie 4: Ventilateurs
entraînés à vitesse maximale de fonctionnement - Amendement 1: Ajout de l'annexe F
fournissant un exemple d'utilisation de l'efficacité et de modifications rédactionnelles
(ISO 12759-4:2019/DAM 1:2026)
Ta slovenski standard je istoveten z: EN ISO 12759-4:2019/prA1
ICS:
23.120 Zračniki. Vetrniki. Klimatske Ventilators. Fans. Air-
naprave conditioners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
Amendment
ISO 12759-4:2019/
DAM 1
ISO/TC 117
Fans — Efficiency classification for
Secretariat: BSI
fans —
Voting begins on:
Part 4:
2026-02-16
Driven fans at maximum operating
Voting terminates on:
speed 2026-05-11
AMENDMENT 1: Addition of Annex
F providing an example of the use of
efficiency classification and editorial
changes
ICS: 23.120
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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.
Reference number
ISO 12759-4:2019/DAM 1:2026(en)

DRAFT
ISO 12759-4:2019/DAM 1:2026(en)
Amendment
ISO 12759-4:2019/
DAM 1
ISO/TC 117
Fans — Efficiency classification for
Secretariat: BSI
fans —
Voting begins on:
Part 4:
Driven fans at maximum operating
Voting terminates on:
speed
AMENDMENT 1: Addition of Annex
F providing an example of the use of
efficiency classification and editorial
changes
ICS: 23.120
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO 12759-4:2019/DAM 1:2026(en)

ii
ISO 12759-4:2019/DAM 1:2026(en)
Foreword
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This document was prepared by Technical Committee ISO/TC 117, Fans.
A list of all parts in the ISO 12759 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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