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A conference of the
Energie- und Umweltzentrum
am Deister GmbH


13th International BUILDAIR Symposium

Airtight Buildings, Thermography and Ventilation Systems in Practice

June 2-3, 2023 - Hannover Congress Centrum (HCC)

Bilingual conference


Dear friends and partners all over the world,

Many thanks to everyone who came to Hanover on June 2nd and 3rd and made the symposium such a great event! As organizers, we are particularly pleased that people from 14 countries were there: from Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Ireland, Latvia, the Netherlands, Serbia, Spain, Switzerland, and the USA. There was a good atmosphere in all the rooms, everyone was talking and laughing with each other. The following impressions should give you an impression of the event.


All the best to you, have a successful time -
we look forward to seeing you again at the next symposium on May 16 and 17, 2025!

 Thanks a lot to the sponsors
BD_Logo.png   Logo_ProclimaMoll.png

Distribution of BlowerDoor Measuring Systems

  • qualified consulting and sale of state-of-the-art measurement technology for airtightness
  • calibration of the measurement systems
  • a comprehensive range of seminars 
  • continuous further development of hardware and software 


Development, production an sale of reliable system solutions for sealing building envelopes

  • internal sealing
  • external sealing
  • bonding agents
  • window sealing
 to the co-operation partners
aivc_logo.gif DEN-eV_Farbe_Web.jpg FLiB.jpg Logo_GIH.png ig_logo.jpg
Inive_logo_transp.gif Logo_PHI_neu_DE.jpg Tightvent-ohne.jpg Logo_VATH_RGB_bearb.png  


 and to the media partners
BauenPlus_Logo_blau_HP.jpg Bauphysik.jpg BWI_Logo.jpg enbausa-Logo.jpg logo_enev_online_gr.gif
GEB_Logo_rgb.jpg gebaeudetechnik_klein_cmyk.png HLH_Logo_web.jpg SHK_web.jpg SHT_beschnitten.jpg
tab_Logo.png logo_umweltdienstleister_web.jpg



These were the topics of the 13th International BUILDAIR Symposium:

Country reports
Country report Germany - FLiB
National Annex to SN EN ISO 9972, effective December 2022
Airtightness vs. local mentality in Greece
Good and airtight building envelopes
Airtightness in existing buildings and installation specifications
Airtightness of exhaust flaps for extractor systems
Unusual behavior of vapor barrier membranes 
Efficiency of ventilation systems
Air flow measurements at two pairs of alternately operating air handling units (push/pull units) under wind impact - part 2
Attempt to improve the functioning of 7 air-supply ductworks connected to 257 high-pressure
induction units - first real diagnosis compaign on a 23 years-old building
Revitalized historical ventilation systems and new windows in classrooms
Energy saving through window service
Energy losses and defects in ventilation systems, especially in single and multi-family homes
Quality assurance
Mold at the construction site
Additional information on standard measurements
Testing of large buildings by using fans in the ventilation system
Building airtightness requirements in Spain
Lock-In Thermography with Blower Excitation for air Leakage Detection at Facades
Improvement of the ISO 9972: proposal for a more reliable standard to measure airleakage rate using fan pressurization method
Measuring special buildings
Air pressure measurements at a particularly airtight and unusual building: "Concrete shell for CO2 storage in recycled concrete aggregates"  
Pressurization time for measuring very airtight buildings and buildings with flexible airtight layers
Zone measurements and their analysis as carried out in apartments
Measuring airtightness of 100-meter high-rise buildings (lessons learned) - part 2



Many thanks to all speakers - for the interesting topics, for the good preparation of the information and for the time discipline. As organizers, we are particularly pleased that all presentations were consistently rated as very good and very informative by the participants!


The participants of the 13th International Buildair Symposium used the trade exhibition during the lecture breaks to find out about proven and new products and services.

Many thanks to all exhibitors of the symposium!

ACIN Instrumenten B.V.: BlowerDoor GmbH: Energie- und Umweltzentrum
am Deister e.V.:
DSC04498_acin.JPG DSC04495_BD.JPG euz-Clip.jpg

Fachverband Luftdichtheit
im Bauwesen e.V.:

Gerd Ott

pro clima Moll bauökologische
Produkte GmbH:
IMG_1777_FLiB.jpg DSC04496_retrotec.JPG IMG_1803_Moll.JPG

Regel-air Becks GmbH & Co. KG:

Siga Cover GmbH Deutschland:

Wöhler Messgeräte Kehrgeräte GmbH:
IMG_1773_Regel-air.JPG DSC04493_Siga.JPG DSC_4329_Woehler.JPG



Conference languages

Simultaneous interpretation will be provided for the complete conference in English and German. 

Conference record

All abstracts will be included in the digital Conference Proceedings in German and English. The contributions provided by the speakers in their original language can be downloaded from the website (www.buildair.eu) after the conference.


Terms of registration

Once you have registered, you will receive a confirmation of your registration, a map along with directions to find the Symposium venue, and the invoice.

Cancellation of registration has to be submitted in writing. We will charge an administrative fee of 60.00 € (incl. VAT) if cancellation is made up to 21 days prior to the Symposium, date as postmarked. After that date, or if you are unable to attend the Symposium, we will charge the full amount as specified in your invoice. Prior consultation provided, you may suggest an alternative participant.

In case the Symposium has to be cancelled for extraordinary reasons, we will inform you immediately. In that event, we are only obliged to refund any participation fees you may have paid before that date. We reserve the right to change the list of speakers and/or the program in exceptional cases. In any case, the liability is limited to the participation fee.

download terms of registration / privacy policy

Open registration form

Conference secretariat

Energie- und Umweltzentrum am Deister GmbH
Zum Energie- und Umweltzentrum 1
31832 Springe, Germany
Tel. +49 5044 975-20
Fax +49 5044 975-66
E-Mail: bildung@e-u-z.de
Kontakt: Sabine Schneider


Contact for journalists

Ursula Mellema

Press releases



Please feel free to download

Order form conference proceedings from previous symposia



Your arrival

Arrival by public transport
From Hanover main station the bus lines 128 and 134 (both direction Peiner Straße) go directly to the HCC.
Alternatively: from the central station take tram line 10 (direction Aegidientorplatz) to Aegidientorplatz, change to tram line 11 (direction zoo), from there directly to the HCC.

Arrival by car
See map, ample parking (entrance to the parking garage in Schackstraße) are available.

Um diese Karte anzuzeigen, nutzen wir den externen Dienst von Google Maps.
Mit dem Laden der Karte akzeptieren Sie die Einbindung dieses Dienstes und darüber hinaus unsere Datenschutzbestimmungen.

Karte laden



Information in accordance with § 5 TMG

Company: Energie-und Umweltzentrum am Deister GmbH
Address of company: Energie- und Umweltzentrum 1
31832 Springe-Eldagsen
Phone: +49 5044 975-0
Fax: +49 5044 975-66
E-Mail: info [at] e-u-z.de
business manager: Uwe Brockmann
Commercial register entry: HRB 102155
registry court Hannover
VAT-Id.-Nr.: DE 196244147
Tax-Nr.: 42/200/03435
Responsible person for the content: Uwe  Brockmann
Dispute resolution: The European Commission provides a platform for online dispute resolution: https://ec.europa.eu/consumers/odr
Our e-mail address is to be found above in the imprint.
We are not willing or obligated to participate in dispute resolution procedures ahead of a consumer arbitration board.
Photos: © Energie- und Umweltzentrum am Deister 


Legal disclaimer

Limitation of liability for internal content

The content of our website has been compiled with meticulous care and to the best of our knowledge. However, we cannot assume any liability for the up-to-dateness, completeness or accuracy of any of the pages. Pursuant to section 7, para. 1 of the TMG (Telemediengesetz – Tele Media Act by German law), we as service providers are liable for our own content on these pages in accordance with general laws. However, pursuant to sections 8 to 10 of the TMG, we as service providers are not under obligation to monitor external information provided or stored on our website. Once we have become aware of a specific infringement of the law, we will immediately remove the content in question. Any liability concerning this matter can only be assumed from the point in time at which the infringement becomes known to us.

Limitation of liability for external links

Our website contains links to the websites of third parties (“external links”). As the content of these websites is not under our control, we cannot assume any liability for such external content. In all cases, the provider of information of the linked websites is liable for the content and accuracy of the information provided. At the point in time when the links were placed, no infringements of the law were recognisable to us. As soon as an infringement of the law becomes known to us, we will immediately remove the link in question.


The content and works published on this website are governed by the copyright laws of Germany. Any duplication, processing, distribution or any form of utilisation beyond the scope of copyright law shall require the prior written consent of the author or authors in question.


May 2018 / source: eRecht24

Privacy Policy

This privacy policy is intended to inform you, as the user of our website, about the nature, scope and purpose of the collection and use of your personal data by us.

Responsible in the sense of the European General Data Protection Regulation (Datenschutz-Grundverordnung, DSGVO) and other national data protection laws of the member states as well as other data protection regulations is:

Energie- und Umweltzentrum am Deister GmbH 
Zum Energie- und Umweltzentrum 1 
31832 Springe-Eldagsen 
Telefon: +49 5044 975-0 
info [at] e-u-z.de

Data Protection

Safeguarding your personal data is a serious matter for us. We want you to feel safe and secure when you visit our websites. The protection of your privacy is an important objective for us when processing your personal data. 

Usually the use of our website is possible without personalized data (i. e. name, address, …). In case you may be asked to provide personal information, answering these questions is optional. We use the personal information provided by you solely for the purpose of assisting you individually, which normally means answering your inquiry. 

Any outside service providers whose services we use for individual offerings on this website, e.g., in connection with our applicant portal, are selected with the utmost degree of care in terms of data protection. The nature and scope of the data processing work to be performed are determined contractually, and the service providers with whom we contract are required to comply with the same level of data protection as we do.


A cookie is a small piece of data that a website asks your browser to store on your computer or mobile device. The cookie allows the website tto "remember" your actions or preferences over time. Most browsers support cookies, but users can set their browsers to decline them and can delete them whenever they like.

Most of our Cookies are so-called “session-cookies”. They are delayed automatically at the end of the visit. Other Cookies remain stored in your computer until you delete them.These Cookies allow us to recognize your browser at your next visit. You can install your browser that you are informed about Cookies and you can allow it in certain cases or install a general deletion of Cookies after your visit. General deactiviation of Cookies may lead to an only. 


The provider of the web pages automatically collects and stores information in so-called server log files, which your browser automatically submits. These are: 
• IP-address            
• browser type / browser version 
• operating system used 
• referrer URL 
• host name of accessing computer 
• date and time of server request 
• content of the requirement
• transferred amount of data
This data is not relatable to specific persons by us. We do not link this data with other data sources. We reserve the right to examine this data retrospectively when we get concrete evidence of unlawful usage


If you send us an inquiry by e-mail, your details, including the contact details you provided there, will be stored for the purpose of processing the request and in case of follow-up questions. We will not share this information without your consent.

Registration form

The personal data you provide us with the registration form will be required for the processing of your registration and participation. If required to perform the contract, your personal information will be passed on to public entities to comply with regulatory requirements (eg, tax authorities), to internal entities to perform the individual business processes (eg, accounting, marketing), and to external partners (eg. mail-order firm). A transfer of your personal data to third parties for purposes other than those mentioned does not occur.

The protection of your personal data is very important to us. However, environmental and climate protection are no less important to us. Therefore, we ask for your permission to send you information about our events by e-mail. You can revoke this consent at any time by written notification (by post, fax or e-mail, address details see above) to the e.u. [z.].

Photos will be taken during the conference for documentation and public relations purposes. Therefore, we ask for your consent to publication. We point out that photos, provided they are published on the Internet, can be accessed by anyone. It can then not be ruled out that such persons continue to use the photos or pass them on to other persons.

You have the right to revoke your consent at any time with effect for the future. In this case, your personal data will be deleted immediately, unless legal provisions preclude this. You can always inform yourself about the data stored about your person. For more information, see your rights section.

Your rights

Upon written request, we will inform you about the specific data we have stored concerning you (e.g., name and address). If you have any questions about data security, please contact us at any time at the address given above. You also have the right to complain to us about the processing of your personal data by a data protection supervisory authority.

Objecting to advertising emails

The use of contact data published under the obligation to provide an imprint for sending of unsolicited advertising and information material is objected to. We reserve the explicit right to initiate legal proceedings in case of receipt of unsolicited advertising, for example by spam emails.


May 2018 / sources: e-recht24.dedatenschutz.org