SIST EN 15780:2025

SLOVENSKI STANDARD
01-september-2025
Prezračevanje stavb - Kanali - Čistoča prezračevalnih sistemov
Ventilation for buildings - Ductwork - Cleanliness of ventilation systems
Lüftung von Gebäuden - Luftleitungen - Sauberkeit von Lüftungsanlagen
Ventilation des bâtiments - Réseaux de conduits - Propreté des systèmes de ventilation
Ta slovenski standard je istoveten z: EN 15780:2025
ICS:
91.060.40 Dimniki, jaški, kanali Chimneys, shafts, ducts
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.

EN 15780
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 91.140.30 Supersedes EN 15780:2011
English Version
Ventilation for buildings - Ductwork - Cleanliness of
ventilation systems
Ventilation des bâtiments - Réseaux de conduits - Lüftung von Gebäuden - Luftleitungen - Sauberkeit von
Propreté des systèmes de ventilation Lüftungsanlagen
This European Standard was approved by CEN on 16 June 2025.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15780:2025 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 Symbols and units . 7
5 Criteria for cleanliness and assessment . 7
5.1 General considerations . 7
5.2 Assessment of the need for cleaning . 7
5.3 Design and handing over information . 8
5.4 Determination of cleaning interval . 8
5.5 Assessment of the cleanliness level after cleaning . 8
6 Methodology . 8
6.1 General . 8
6.2 Assessment methodology .10
6.2.1 General .10
6.2.2 Cleanliness inspection plan .10
6.2.3 Evaluation methods of dust accumulation .11
6.3 Cleaning plan .11
6.4 Cleaning methods .11
7 Evaluation and reporting .12
7.1 General .12
7.2 Evaluation of cleaning .12
7.3 Cleaning report .12
Annex A (informative)  Cleanliness quality classes of ventilation systems .14
Annex B (informative)  Example of cleaning plan for air ventilation system .17
Annex C (informative) Air handling units – specific guidance .20
Annex D (informative)  Specific guidance for filters in air handling units .22
Annex E (informative)  Specific guidance for humidifiers in air handling units .23
Annex F (informative) Ductwork – Specific installation guidance for air ventilation system
....................................................................................................................................................................24
Annex G (informative) Terminal devices and units – Specific guidance air ventilation system
....................................................................................................................................................................27
Annex H (informative) Measurement methods for dust accumulation – Air ventilation
system .28
Annex I (informative) European vacuum test method for measuring dust accumulation in air
ventilation systems.31
Annex J (informative) Commercial kitchen extract ventilation system – Specific guidance 33
Annex K (informative) Wiping test method to evaluate cleanliness on site . 41
Bibliography . 43

European foreword
This document (EN 15780:2025) has been prepared by Technical Committee CEN/TC 156 “Ventilation
for buildings”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2026, and conflicting national standards shall
be withdrawn at the latest by January 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15780:2011.
— addition of kitchen extract ventilation system (Annex J);
— addition of wiping test method to evaluate cleanliness on site (Annex K).
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
Introduction
This document provides test methods and classifications for cleanliness in ventilation systems.
This document is made with informative annexes that can be revised, completed and further added in
future revisions of this document for specific system types, and products or applications in the system.
See Annexes A, B, C, D, E, F, G, H, I, J and K for further information.
1 Scope
This document specifies general requirements and gives guidelines for ventilation systems except for
industrial, medical and laboratory facilities.
This document also specifies cleanliness criteria and procedures necessary in assessing and maintaining
the cleanliness of ventilation systems over their lifetime from design and installation to maintenance.
This document is applicable to both new and existing ventilation systems with, and without, air
conditioning and kitchen extract systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12792, Ventilation for buildings — Symbols, terminology and graphical symbols
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
acceptable cleanliness level
amount of dust or other contaminants not to be exceeded according to the specified measurement
method
3.2
acceptable post-clean level
no loose dust (clean-swept condition) or no adhered grease deposits are detected visually on the duct
surface after cleaning and the system can reach an acceptable cleanliness level according to a specified
measurement method
Note 1 to entry: In case of conflict (for example, between the building owner and the user), or uncertainty, objective
methods are needed to assess the cleanliness/dirtiness.
3.3
cleanliness
state or amount of pollution according to specification and a particular measurement method
Note1 to entry: Cleanliness is not absolute; it is defined by limit values.
3.4
dirtiness
value above limit value for cleanliness
3.5
grease separator
device for the efficient separation of airborne solid or liquid particles, based on the effect of mechanical
forces that deflect the particles out of the airflow
[SOURCE: EN 16282-6:2020, definition 3.2, modified – term “separator” is replaced by “grease
separator”]
4 Symbols and units
For the purpose of this document, the symbols and units in EN 12792 apply.
5 Criteria for cleanliness and assessment
5.1 General considerations
The key issue is to design, build and maintain the whole ventilation system so that it can be kept clean
enough during the whole lifetime of the system. The requirements in this document, as well as the
methodology described in Clause 6, apply to the ductwork but can be also applied to air handling units
according to EN 13053, entire systems and kitchen extract systems. Therefore, it is necessary to specify
the cleanliness quality class from the beginning and include in the specification both design and
installation issues, and means to maintain a sufficiently clean ventilation system for the its whole lifetime.
The design and installation document should include the following, which are described in EN 16798-3,
EN 16798-17, and EN 12599:
a) cleanliness quality class;
b) cleanliness criteria and measurement method;
c) production of the system components;
d) delivery to site;
e) site storage;
f) installation;
g) airtightness;
h) protection of components after installation;
i) handing over the system;
j) inspection.
5.2 Assessment of the need for cleaning
Cleanliness of ventilation systems is a part of proper maintenance of the ventilation systems. Mostly the
inspection of the cleanliness can arise from two purposes:
a) to check if ventilation system is dirty and needs to be cleaned (exceeding of a “target level” of
cleanliness);
b) to evaluate cleanliness after the cleaning work.
NOTE The assessment methodology is presented in 6.2.
For existing buildings, the inspection
...