SIST EN 14986:2024/oprA1:2026

Design of fans working in potentially explosive atmospheres

1.1   This document specifies the constructional requirements for fans constructed to Group II G (of explosion groups IIA, IIB and hydrogen) categories 1, 2 and 3, and Group II D categories 2 and 3, intended for use in explosive atmospheres.
NOTE 1   Operation conditions for the different categories of fans used in this document are defined in Clause 4.
1.3   This document specifies requirements for design, construction, testing and marking of complete fan units intended for use in potentially explosive atmospheres in air containing gas, vapour, mist and/or dusts. Such atmospheres can exist inside (the conveyed atmosphere (flammable or not)), outside, or inside and outside of the fan.
This document covers mechanical equipment, in particular fans. The “type of protection” as specified in EN ISO 80079 37:2016 is constructional safety.
1.4   This document is applicable to fans working in ambient atmospheres and with normal atmospheric conditions at the inlet, having
—   absolute pressures ranging from 0,8 bar to 1,1 bar,
—   and temperatures ranging from −20 °C to +60 °C,
—   and maximum volume fraction of 21 % oxygen content,
—   and an aerodynamic energy increase of less than 25 kJ/kg.
NOTE 1   25 kJ/kg is equivalent to 30 kPa at inlet density of 1,2 kg/m3.
This document can also be helpful for the design, construction, testing and marking of fans intended for use in atmospheres outside the validity range stated above or in cases where other material pairings need to be used. In this case, the ignition risk assessment, ignition protection provided, additional testing (if necessary), manufacturer's marking, technical documentation and instructions to the user, clearly demonstrate and indicate the equipment's suitability for the conditions the fan can encounter.
NOTE 2   Temperatures below −20 °C can be considered. Material suitability can require specific evaluation for these temperatures. With lower temperature the explosion pressure increases, which leads to increased test pressures (see A.3) and can require specific testing. Although the standard atmospheric conditions in EN ISO 80079 36:2016 give a temperature range for the atmosphere of −20 °C to +60 °C the normal ambient temperature range for the equipment is −20 °C to +40 °C unless otherwise specified and marked.
1.5   This document does not apply to:
—   group I fans (fans for mining);
—   explosion group IIC (other than hydrogen);
—   category 1D fans;
—   cooling fans or impellers on rotating electrical machines;
—   cooling fans or impellers on internal combustion engines, vehicles or electric motors.
NOTE 3   Measures for category 1D fans are given in EN 1127 1:2019.
NOTE 4   Measures for explosion group IIC (other than hydrogen) are given in EN 1127 1:2019.
NOTE 5   Measures for explosion group I are given in EN ISO/IEC 80079 38:2016 and EN 1127 2:2014.

Konstruktion von Ventilatoren für den Einsatz in explosionsgefährdeten Bereichen

Conception des ventilateurs pour les atmosphères explosibles

Načrtovanje ventilatorjev za delovanje v potencialno eksplozivnih atmosferah

1.1   Ta dokument določa konstrukcijske zahteve za ventilatorje, izdelane za skupino II G (eksplozijske skupine IIA, IIB in vodik) kategorij 1, 2 in 3 ter skupino II D kategorij 2 in 3, namenjene za uporabo v eksplozivnih atmosferah.
OPOMBA 1   Obratovalni pogoji za različne kategorije ventilatorjev, uporabljenih v tem dokumentu, so opredeljeni v točki 4.
1.3   Ta dokument določa zahteve za načrtovanje, konstrukcijo, preskušanje in označevanje celotnih enot ventilatorjev, namenjenih za uporabo v potencialno eksplozivnih atmosferah v zraku, ki vsebuje plin, hlape, meglo in/ali prah. Takšne atmosfere lahko obstajajo znotraj (prenašano ozračje (vnetljivo ali ne)), zunaj ali znotraj in zunaj ventilatorja.
Ta dokument zajema mehansko opremo, zlasti ventilatorje. "Vrsta zaščite", kot je določeno v EN ISO 80079 37:2016, je konstrukcijska varnost.
1.4   Ta dokument velja za ventilatorje, ki delujejo v okoliških atmosferah in z normalnimi atmosferskimi pogoji na vstopu, z
—   absolutnimi tlaki v razponu od 0,8 bara do 1,1 bara,
—   in temperaturami v razponu od −20 °C do +60 °C,
—   in največjo volumensko frakcijo 21 % vsebnosti kisika,
—   in aerodinamičnim povečanjem energije manj kot 25 kJ/kg.
OPOMBA 1   25 kJ/kg je enakovredno 30 kPa pri vstopni gostoti 1,2 kg/m3.
Ta dokument je lahko tudi v pomoč pri načrtovanju, konstrukciji, preskušanju in označevanju ventilatorjev, namenjenih za uporabo v atmosferah zunaj zgoraj navedenega veljavnega območja ali v primerih, ko je treba uporabiti druge kombinacije materialov. V tem primeru ocena tveganja vžiga, zagotovljena zaščita pred vžigom, dodatno preskušanje (če je potrebno), označevanje proizvajalca, tehnična dokumentacija in navodila za uporabnika jasno dokazujejo in označujejo primernost opreme za pogoje, s katerimi se ventilator lahko sreča.
OPOMBA 2   Temperature pod −20 °C se lahko upoštevajo. Primernost materiala lahko zahteva posebno oceno za te temperature. Z nižjo temperaturo se poveča eksplozijski tlak, kar vodi do povečanih preskusnih tlakov (glej A.3) in lahko zahteva posebna preskušanja. Čeprav standardni atmosferski pogoji v EN ISO 80079 36:2016 določajo temperaturno območje za atmosfero od −20 °C do +60 °C, je normalno temperaturno območje za opremo od −20 °C do +40 °C, razen če ni drugače določeno in označeno.
1.5   Ta dokument ne velja za:
—   ventilatorje skupine I (ventilatorje za rudarstvo);
—   eksplozijsko skupino IIC (razen vodika);
—   ventilatorje kategorije 1D;
—   hladilne ventilatorje ali rotorje na rotacijskih električnih strojih;
—   hladilne ventilatorje ali rotorje na motorjih z notranjim zgorevanjem, vozilih ali električnih motorjih.
OPOMBA 3   Ukrepi za ventilatorje kategorije 1D so navedeni v EN 1127 1:2019.
OPOMBA 4   Ukrepi za eksplozijsko skupino IIC (razen vodika) so navedeni v EN 1127 1:2019.
OPOMBA 5   Ukrepi za eksplozijsko skupino I so navedeni v EN ISO/IEC 80079 38:2016 in EN 1127 2:2014.

General Information

• Status: Not Published
• Public Enquiry End Date: 30-Aug-2026
• ICS: 23.120 - Ventilators. Fans. Air-conditioners
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: EXP - Product for explosive atmospheres
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 10-Jun-2026
• Due Date: 28-Oct-2026
• Directive: Harmonized Standard2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
• Mandate: M/596 - [C(2023)4798] Commission Implementing Decision of 20.7.2023 on a standardisation request as regards equipment and protective systems intended for use in potentially explosive atmospheres in support of Directive 2014/34/EU (ATEX) of the European Parliament and of the Council
• Ref Project: EN 14986:2024/prA1 - Design of fans working in potentially explosive atmospheres

Relations

• Amends: SIST EN 14986:2024 - Design of fans working in potentially explosive atmospheres
• Effective Date: 25-Jun-2025

Overview

SIST EN 14986:2024/oprA1:2026 is a European standard developed by CEN, focusing on the design of fans for potentially explosive atmospheres. Its main objective is to ensure the safe construction, design, testing, and marking of fans intended for environments containing explosive gases, vapors, mists, and/or dusts. This standard applies specifically to fans constructed for Group II G (explosion groups IIA, IIB, and hydrogen) and Group II D, addressing categories 1, 2, and 3, and is essential for compliance with EU Directives on equipment for explosive atmospheres (ATEX).

This standard sets out constructional requirements to minimize ignition risks and optimize protection in industrial and commercial applications. It covers both mechanical and safety considerations and refers to constructional safety as outlined in EN ISO 80079-37:2016. SIST EN 14986:2024/oprA1:2026 is crucial for manufacturers, designers, and users of fans operating in or around explosive atmospheres.

Key Topics

• Scope and Categories

  • Applies to Group II G (IIA, IIB, hydrogen) categories 1, 2, 3 and Group II D categories 2, 3 fans.
  • Addresses fans used in explosive atmospheres both inside and/or outside the fan unit.

• Design and Constructional Requirements

  • Specifies mechanical and constructional safety measures.
  • Covers shaft seals, material pairings, linings, tip extensions, and electrostatic charge management.
  • Establishes operating parameters: absolute pressures (0.8-1.1 bar), temperatures (−20°C to +60°C), and oxygen content (≤21% by volume).

• Testing and Marking

  • Outlines procedures to prove fan safety and compliance.
  • Requires proper marking and technical documentation to ensure traceability and safe operation.

• Electrostatic Hazards

  • Mandates design features to eliminate the risk of ignition from electrostatic discharges (per EN ISO 80079-36).
  • Emphasizes grounding and bonding measures for both static and moving parts.

• Exclusions

  • Not applicable to group I fans (mining), explosion group IIC (except hydrogen), category 1D fans, fans on electric machines and engines.

Applications

• Industrial Facilities

  • Chemical plants, refineries, paint shops, and other environments where flammable gases or dusts may be present.
  • HVAC systems in areas with a risk of explosion due to airborne hazardous substances.
  • Ventilation systems in pharmaceutical, petrochemical, or food processing industries.

• Hazardous Zones

  • Fans for use in ATEX Zone 1, Zone 2 (gases and vapours) and Zone 21, Zone 22 (dusts), ensuring compliance with local and international regulations for workplace safety.

• Design and Manufacturing

  • Used by fan manufacturers and engineers during product development.
  • Reference for conducting ignition risk assessments and selecting material pairings suitable for specific explosive atmospheres.

Related Standards

• EN ISO 80079-36:2016 - Explosive atmospheres - Non-electrical equipment for explosive atmospheres - Basic method and requirements.
• EN ISO 80079-37:2016 - Explosive atmospheres - Non-electrical equipment for explosive atmospheres - Protection by constructional safety.
• EN IEC 60079-14:2024 - Explosive atmospheres – Electrical installations design, selection, and installation.
• EN ISO/IEC 80079-49:2024 - Flame arresters - Performance requirements and test methods.
• CLC/TR 60079-32-1:2018 - Explosive atmospheres - Electrostatic hazards guidance.
• EN ISO/IEC 80079-38:2016 - Equipment for mining atmospheres.
• EN 1127-1:2019 - Explosion prevention and protection - Basic concepts and methodology.

SIST EN 14986:2024/oprA1:2026 is a key technical reference for safe fan design in explosive atmospheres, supporting compliance with the EU ATEX Directive and forming part of a comprehensive set of harmonized European safety standards. Adhering to this standard helps minimize ignition risk, promotes proper installation, and ensures ongoing safety for hazardous workplace environments.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2026
Načrtovanje ventilatorjev za delovanje v potencialno eksplozivnih atmosferah
Design of fans working in potentially explosive atmospheres
Konstruktion von Ventilatoren für den Einsatz in explosionsgefährdeten Bereichen
Conception des ventilateurs pour les atmosphères explosibles
Ta slovenski standard je istoveten z: EN 14986:2024/prA1
ICS:
23.120 Zračniki. Vetrniki. Klimatske Ventilators. Fans. Air-
naprave conditioners
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 14986:2024
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
August 2026
ICS
English Version
Design of fans working in potentially explosive
atmospheres
Conception des ventilateurs pour les atmosphères Konstruktion von Ventilatoren für den Einsatz in
explosibles explosionsgefährdeten Bereichen
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 305.

This draft amendment A1, if approved, will modify the European Standard EN 14986:2024. 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 14986:2024/prA1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modification to Clause 2 and to Bibliography. 4
2 Modification to 4.4.2 . 4
3 Modification to 4.7.2 ”Permissible material pairings“ . 4
4 Modification to 4.8 ”Linings and tip extensions“ . 4
5 Modification to 4.10 “Earthing conducting parts” and 4.11 “Electrostatic charges” . 4
6 Modification to 4.14 “Shaft Seals” . 5
7 Modification to 6.3.1 “General” . 5
8 Modification to Annex ZA . 5

European foreword
This document (EN 14986:2024/prA1:2026) has been prepared by Technical Committee CEN/TC 305
“Explosion prevention and protection”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
1 Modification to Clause 2 and to Bibliography
Move “CLC/TR 60079-32-1:2018 Explosive atmospheres - Part 32-1: Electrostatic hazards, guidance” to
Bibliography.
Replace “EN 60079-14:2014, Explosive atmospheres — Part 14: Electrical installations design, selection
and erection (IEC 60079-14:2013)” by “EN IEC 60079-14:2024, Explosive atmospheres — Part 14:
Electrical installation design, selection and inst
...