oSIST prEN 15665:2025
(Main)Ventilation for buildings - Ventilation systems in residential buildings - Design
Ventilation for buildings - Ventilation systems in residential buildings - Design
This document provides guidance for the design of ventilation systems for basic ventilation in residential buildings to achieve an acceptable indoor air quality. It gives two approaches:
- prescriptive approach;
- performance-based approach.
This document establishes guidelines for the usage of both the prescriptive and performance-based approaches. This document specifies performance indicators that can be used with the performance-based approach.
This document partly covers intensive ventilation for indoor air quality purposes.
This document concerns residential buildings but primarily focuses on dwellings (flats, apartments, and houses) and is also applicable to parts of other types of residential buildings.
This document is applicable to, but not limited to:
- mechanical ventilation;
- natural ventilation;
- hybrid ventilation.
This document does not apply to:
- dilution of tobacco smoke or radon and other soil gases;
- ventilation of garages, roof voids, sub-floor voids, wall cavities and other spaces in the structure, under, over or around the living space;
- providing air for combustion appliances;
- air cleaning (e.g. portable stand-alone air cleaners to clean the indoor air);
- air humidification or de-humidification;
- thermal comfort in regard to overheating aspects.
This document does not deal with the assessment of energy performance of buildings.
Lüftung von Gebäuden - Lüftungssysteme in Wohngebäuden - Design
Dieses Dokument bietet eine Anleitung für die Auslegung von Lüftungssystemen für die Grundlüftung in Wohngebäuden, um eine annehmbare Raumluftqualität zu erreichen. Es stellt zwei Ansätze zur Verfügung:
- präskriptiver Ansatz;
- leistungsbasierter Ansatz.
Dieses Dokument bietet Leitlinien für die Verwendung sowohl des präskriptiven als auch des leistungsbasierten Ansatzes. Dieses Dokument legt die Leistungskennzahlen fest, die mit dem leistungsbasierten Ansatz verwendet werden können.
Dieses Dokument beschreibt teilweise die Intensivlüftung zur Verbesserung der Raumluftqualität.
Dieses Dokument gilt auch für Wohngebäude, legt aber den Schwerpunkt auf Wohnungen (Appartements und Häuser) und ist auch auf Teile anderer Wohngebäude anwendbar.
Dieses Dokument gilt unter anderem für:
- ventilatorgestützte Lüftung;
- freie Lüftung;
- Hybridlüftung.
Dieses Dokument gilt nicht für:
- Verdünnung von Tabakrauch oder Radon und anderen Bodengasen;
- Lüftung von Garagen, Dachräumen, Hohlräumen im Unterboden, Wandhohlräumen und anderen Räumen in der Gebäudestruktur, unter, über oder um den Wohnraum herum;
- Bereitstellung von Luft für Verbrennungsgeräte;
- Luftreinigung (z. B. tragbare, freistehende Luftreiniger zur Reinigung der Innenraumluft);
- Luftbefeuchtung oder -entfeuchtung;
- thermische Behaglichkeit in Bezug auf Überhitzungsaspekte.
Dieses Dokument behandelt nicht die Beurteilung der Energieeffizienz von Gebäuden.
Ventilation des bâtiments - Systèmes de ventilation dans les bâtiments résidentiels - Conception
Le présent document fournit des lignes directrices pour la conception des systèmes de ventilation pour la ventilation de base dans les bâtiments résidentiels afin d'obtenir une qualité de l’air intérieur acceptable. Il donne deux approches :
— approche prescriptive ;
— approche performancielle.
Le présent document établit des lignes directrices pour l’utilisation des deux approches normative et fondée sur la performance. Le présent document spécifie les indicateurs de performance qui peuvent être utilisés avec l’approche performancielle.
Le présent document couvre en partie la ventilation intensive pour des raisons de qualité de l’air intérieur.
Le présent document concerne les bâtiments résidentiels mais se concentre principalement sur les logements (appartements, logements et maisons) et s’applique également à des parties d’autres types de bâtiments résidentiels.
Le présent document est applicable à, mais sans s’y limiter :
- la ventilation mécanique ;
- la ventilation naturelle ;
- la ventilation hybride.
Le présent document ne s’applique pas :
- à la dilution de la fumée de tabac ou du radon et d’autres gaz du sol ;
- à la ventilation des garages, vides sous toit, espaces vides de faux planchers, cavités des murs et autres espaces dans la structure, sous, sur ou autour de l’espace de vie ;
- à l’alimentation en air des appareils de combustion ;
- à l’épuration de l’air (par exemple épurateurs d’air autonomes portatifs pour l’épuration de l’air intérieur) ;
- à l’humidification ou la déshumidification de l’air ;
- au confort thermique en ce qui concerne les aspects de surchauffe.
Le présent document ne traite pas de l’évaluation de la performance énergétique des bâtiments.
Prezračevanje stavb - Prezračevalni sistemi v stanovanjskih stavbah - Projektiranje
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2025
Prezračevanje stavb - Prezračevalni sistemi v stanovanjskih stavbah -
Projektiranje
Ventilation for buildings - Ventilation systems in residential buildings - Design
Lüftung von Gebäuden - Lüftungssysteme in Wohngebäuden - Design
Ventilation des bâtiments - Systèmes de ventilation dans les bâtiments résidentiels -
Conception
Ta slovenski standard je istoveten z: prEN 15665
ICS:
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.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2025
ICS 91.140.30 Will supersede CEN/TR 14788:2006, EN 15665:2009
English Version
Ventilation for buildings - Ventilation systems in
residential buildings - Design
Ventilation des bâtiments - Systèmes de ventilation Lüftung von Gebäuden - Lüftungssysteme in
dans les bâtiments résidentiels - Conception Wohngebäuden - Design
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 156.
If this draft becomes a European Standard, 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.
This draft European Standard 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15665:2025 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 Abbreviated terms . 9
5 Limitation of the use of options and technical solutions . 10
6 Main purpose and other design aspects of ventilation . 10
6.1 Main purpose of ventilation . 10
6.2 Other design aspects related to ventilation. 11
6.2.1 Energy use . 11
6.2.2 Acoustics . 11
6.2.3 Draught . 11
6.2.4 Outdoor pollutants . 11
6.2.5 Operation, maintenance and cleaning . 12
7 Technical aspects of a ventilation system . 12
7.1 General . 12
7.2 Ventilation strategy (ventilation organization plan) . 12
7.3 Operating principle . 17
7.3.1 Mechanical ventilation . 17
7.3.2 Natural ventilation . 18
7.3.3 Hybrid ventilation . 18
7.4 Control equipment . 19
7.5 Building airtightness . 21
8 Primary ventilation requirements and design approaches . 21
8.1 General . 21
8.2 Expression of primary ventilation requirements . 22
8.3 Performance-based approach . 23
8.4 Prescriptive approach . 24
9 Design steps for the performance-based approach . 25
9.1 General . 25
9.2 Design of a ventilation system in a specific building . 25
9.3 Design of ventilation installation package . 26
10 Design steps for the prescriptive approach. 27
11 Performance assessment method . 27
11.1 General approach . 27
11.2 Primary ventilation requirements and performance indicators . 28
11.2.1 Primary ventilation requirements . 28
11.2.2 Air flow rate related performance indicators . 28
11.2.3 IAQ related performance indicators . 28
11.3 Calculation model and assumptions . 29
11.3.1 Calculation model . 29
11.3.2 Input data for the calculation model . 30
11.4 Aggregation of the calculation results . 30
12 Documentation of specifications and layout . 30
Annex A (informative) Template for the limitation of the use of options and technical
solutions at national level . 31
Annex B (informative) Examples of primary ventilation requirements based on air flow
rates and of prescriptive requirements . 38
Annex C (informative) Comparison of the performance-based and the prescriptive
approach . 46
Annex D (informative) Design aspects specific to mechanical ventilation . 48
Annex E (informative) Design aspects specific to natural ventilation . 53
Annex F (informative) Design aspects specific to hybrid ventilation . 58
Annex G (informative) Control equipment . 64
Annex H (informative) Typical types of performance indicators to be used in the
performance-based approach . 67
Annex I (informative) Specifying design assumptions . 71
Annex J (informative) Usage agreement for operation . 75
Bibliography . 77
European foreword
This document (prEN 15665:2024) has been prepared by Technical Committee CEN/TC 156 “Ventilation
for buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15665:2009 and CEN/TR 14788:2006.
In addition to a number of editorial revisions, the following main changes have been made:
— a distinction between “prescriptive approach” and “performance-based approach” (based on the
performance assessment method) has been made;
— a (normative) National Annex A, with open templates for the prescriptive approach and
performance-based approach has been added.
Introduction
The main role of ventilation is to replace the air in order to ensure an acceptable indoor air quality. It also
helps to maintain the integrity of the building and improve the comfort of its occupants by controlling the
humidity to avoid too low and too high humidity. But this document only focuses on indoor air quality.
Ventilation dilutes natural background pollutants such as substances emitted by furnishings, building
materials and cleaning products used in the building, odours, metabolic CO and water vapour.
Ventilation also dilutes specific pollutants from identifiable local sources such as toilet odours, water
vapour from the kitchen or bathroom.
Design of ventilation systems commonly considers other aspects like energy use, acoustics, draught,
outdoor pollutants and cleaning and maintenance, though these are not covered in detail in this
document.
There are both risks for the occupants and the building in terms of IAQ, specifically of relative humidity
(one indicator for indoor air quality and thermal comfort).
IAQ can be controlled by the following means: source control, ventilation, and potentially air filtration or
air cleaning.
This document is intended to support any regulation or standard at national level by giving guidance to
those with responsibility for producing requirements and standards for residential ventilation systems.
It includes a national annex template for fixing choices and setting primary ventilation requirements at
national level. A filled in national annex, is directly usable by the designer for precise requirements on
design of a ventilation system.
This document has a link to EN 16798-1 and EN 16798-7, in which basic information on possible indoor
air quality requirements can be found, and gives information on how to calculate air flow rates in
buildings.
1 Scope
This document provides guidance for the design of ventilation systems for basic vent
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