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User Data Privacy Protection Notice

We at Keller Lufttechnik GmbH + Co. KG are very pleased with your interest regarding our company. The protection of your personal data is of vital importance to our management.

This data privacy notice is to inform you of the types, scope and purpose of personal information that is collected, used and processed by us.

We adopted a number of technological and organizational measures to ensure the maximum protection of personal data that is processed via this internet page. We use an SSL / TSL coding for safety reasons and to protect private content during the processing of inquiries submitted by you via the contact application form. You will recognize the transmission coding when the address in your browser changes from “http: to https:” with a lock symbol in your browser line. When the SSL/TSL coding is activated, the information that you are sending to us cannot be accessed by a third party. Nevertheless, internet-based data transmissions might still contain security gaps. Absolute protection of personal data cannot be guaranteed.  This is why you may feel free to provide your personal information to us by using an alternate means such as a phone call.


Name and contact information of the responsible party

According to data protection law, the responsible party is:

Keller Lufttechnik GmbH + Co. KG
Neue Weilheimer Straße 30
73230 Kirchheim unter Teck

Fon: +49 7021 574 0
E-Mail: [email protected]

Name and contact information of the data protection officer

The data protection officer is:
Matthias Haußer
Keller Lufttechnik GmbH + Co. KG
Neue Weilheimer Straße 30
73230 Kirchheim unter Teck
Fon: +49 7021 574 0
E-Mail: [email protected]

Individuals having any concerns may contact our data protection officer at any time regarding all questions and suggestions relating to data protection.

Collection of general data and information

We collect and automatically store information in our server log files that your browser is automatically sending us. These are:

  • Browser type and version
  • Operating system in use
  • The internet page from which you access our internet page  (known as Referring URL)
  • Each page viewed 
  • Host name of your computer
  • Date and time of server request
  • Your IP address
  • Your internet service provider (ISP)
  • Other similar data and information that will be used for emergency notification in the event of a breach of our information technology systems.  

When gathering this general data and information, we do not form opinions regarding you. Rather, this information is important to us in order to:

  • provide accurate content in our internet pages,
  • optimize the content of our internet pages and advertising,
  • ensure the durable functionality of our information technology systems and the strategy of our web pages, and
  • furnish vital information to enforcement agencies in the event of a cyberattack.

The basis for data processing is the German Regulation: Art. 6, Par. 1, lit. b DSGVO, which permits the processing of data required for the necessary steps in order processing or contract fulfillment.

Your IP address will be automatically deleted after one week. 

Newsletter Subscription

Our web page gives you an opportunity to subscribe to our newsletter free of charge. During registration for the newsletter, your input data (name, e-mail address) is transmitted to us.

Our periodic newsletter informs subscribers, customers and business partners about our various offers. The newsletter is sent to you only if you (1) have a valid e-mail address, and if (2) you have requested it. For legal purposes, a confirmation e-mail with a double Opt-In process is sent to the e-mail address you provide us when requesting our newsletter. This confirmation e-mail is to verify ownership of the e-mail address authorizing receipt of our newsletter. 

When you subscribe to our newsletter, we further store your IP address, with the date and time of registration. Collection of this data is necessary for transparency reasons in the event of a potential fraudulent misuse of the e-mail address at a later time. This is for our own legal protection.
Personal data collected within the framework of registration for the newsletter is used only for sending the newsletter. Collection of any other personal data during registration is used to prevent the fraudulent use of this service or your e-mail address.

Additionally, subscribers may be informed via e-mail during the newsletter subscription or the registration for it, when there are updates to newsletter offers or to provide advance notice of upcoming engineering changes. Any personal data collected within the framework of our newsletter service is processed according to instructions by GTC Gutacker TeleCommunication GmbH, Zimmermannstr. 15, 70182 Stuttgart. Personal data collected from the newsletter service is not shared with third parties.

You may cancel your subscription to our newsletter at any time. Your approval to store your personal data that you provided us for subscription purposes can be revoked by you at any time.  Each newsletter provides a link for cancellation. In addition, it is possible to terminate your subscription to our newsletter directly by using our internet pages, or you may feel free to inform us by any other means.

The legal basis for the processing of data following subscription to a newsletter is the German Regulation: Art. 6, Par.1, lit. a DSGVO.

The data is deleted once it is no longer necessary for achieving the intended purpose of its collection. Your e-mail address is stored as long as your subscription to the newsletter remains active.

Establishing contact via internet page

Pursuant to legal requirements, our internet page includes information that allows rapid electronic connection to our company and direct communication with us by e-mail. If you contact us by e-mail or via our coded contact form, the personal data transmitted by you is automatically stored. Such voluntary personal data is stored solely for the purposes of processing your inquiry or for contacting you. No personal data is shared with third parties.

The legal basis for the processing of newsletter subscription data is the German Regulation: Art. 6, Par. 1, lit. f, or possibly lit. b DSGVO.

The data you have entered into our contact form will remain with us until you request us to delete it or until the purpose for the data has expired, (e.g., after the processing of your inquiry or sales contract is complete). Legal regulations such as mandatory retention periods remain unaffected.

Employment applications and application processes

We collect and process personal data from applicants for the sole purpose of processing the application. Processing can also occur electronically, especially when application documents  are transmitted via e-mail or via the form provided on our web page.

If we agree to an employment contract with an applicant, the transmitted data is stored for the purpose of processing the employment as specified by legal regulations. If there is no employment contract, the application documents will be deleted automatically 2 months after notification of rejection, provided said deletion is not counter to any other legally justifiable interests of our company. A legally justifiable interest in this context would be, for example, for providing proof of compliance with the General Equality Act (AGG). In this case, the application documents are stored for 6 months.

The legal basis for processing of application information is German Regulation: Art. 88 DSGVO in connection with § 26 BDSG.

Cookie Usage

Our internet page utilizes Google Analytics (with anonymous function). Google Analytics is a web analysis service of Google Inc., 1600 Amphitheatre Pkwy, Mountain View, CA 94043-1351, USA.

Google Analytics operates with text files that are stored in your unit (known as cookies). Data is collected about what internet page provided access to our internet page (known as referrer), which subpages were viewed, and how frequently and for how long our internet pages were viewed.

This data is automatically transmitted with each connection to a Google server in the USA and stored there. No data regarding you will be combined with other data already stored at Google.  However, Google may potentially share this collected personal data with third parties.Google uses this information on our behalf to provide us with an analysis of website usage, website activities, and other services. This helps us to optimize our website.

We use the masking function „anonymize IP“. Prior to transmitting your IP address to the Google servers in the USA, it will be abridged inside the EU. A transfer of the original IP address rarely occurs, and it is then abbreviated on servers in the USA.

Note on the processing of your data collected on this website in the USA by Google, Facebook, LinkedIn, YouTube: By agreeing to the use of these cookies, you also consent to your data being processed in the USA (Art. 49 Paragraph 1 Clause 1 lit. a GDPR). The US is assessed by the European Court of Justice as a country with an inadequate level of data protection according to EU standards. In particular, there is a risk that your data may be processed by US authorities for control and monitoring purposes, possibly even without the possibility of redress.

You can prevent this process by taking the following measures:

  • Prevent the use of cookies by our internet page at any time by using a special setting on your internet browser, and thus the long-term prevention of cookies.
  • An already placed cookie can be deleted by Google Analytics via the internet browser or other software

Additional information and current data protection regulations at Google can be viewed at: and under Google Analytics is explained in detail at:

We have a legitimate interest in the use of Google Analytics which is in predominant use. There is minimal access via the anonymous page design and less interference into the right to personal privacy (see Art. 6, Par. 1, lit. f DSGVO).

Google Maps

On our webpages, we use Google Maps to provide you with local contact information, such as “contact person Germany”. Google Maps is a service of Google Inc., Amphitheatre Parkway, Mountain View, CA 94043, USA.

When using Google Maps it is necessary to store your IP address. This information is, as a rule, transmitted to a Google server in the USA and stored there. We do not have any power over this data transfer.

The use of Google Maps is in the interest of an attractive presentation of our online offers and for ease of locating sites mentioned on our web pages. This constitutes a legitimate interest within the context of Art. 6, Abs. 1 lit. f DSGVO.

Note on the processing of your data collected on this website in the USA by Google, Facebook, LinkedIn, YouTube: 
By agreeing to the use of these cookies, you also consent to your data being processed in the USA (Art. 49 Paragraph 1 Clause 1 lit. a GDPR). The US is assessed by the European Court of Justice as a country with an inadequate level of data protection according to EU standards. In particular, there is a risk that your data may be processed by US authorities for control and monitoring purposes, possibly even without the possibility of redress.

For more information on the handling of user data, please see the data protection statement from Google at:


Please see for our own facebook fanpage (“Fanpage”) by which you can contact us and leave comments as well. Personal data such as your name is used to reply to your inquiry or comments.

When you visit us by the fanpage, Facebook Ireland Ltd., 4 Grand Canal Square, Grand Canal Harbour, Dublin 2, Irland („Facebook“) uses your IP address or the page from which you have activated the fanpage (so-called referrer-URL). This also happens if you do not have an own facebook account and just read our fanpage. Details of personal data that are processed by facebookk are mentioned on facebook’s  data guideline under . According to a judgment of the European Court of Justice from June 05, 2018 (reference C-210/16) there is a common responsibility between fanpage providers like us and facebook for so-called insights data. Insights data are collected personal data relating to a visit or interaction of persons on / by a fanpage and its content.

To meet the common responsibility according to the jurisdiction of the European Court of Justice there is a special agreement between facebook and us. For details please see
The vested right for you according to the data protection law can be claimed according to Art. 26 Abs. 3 DS-GVO (facebook or us). Details about your rights are mentioned under “your rights”.

Microsoft Teams

Purpose of data processing
Keller Lufttechnik utilizes Microsoft Teams to schedule conference calls, online meetings, video conferences and/or web conferences (hereinafter referred to as "online meetings"), among our employees (in their home offices or inside the company), or between them and third parties such as business partners, including customer care, manufacturer support and continuous improvement. Microsoft Teams is a service of Microsoft Corporation.

Keller Lufttechnik GmbH + Co. KG is responsible for data processing that is directly related to the systematic planning of online meetings.

Important note: Should you visit the Microsoft Teams website, the provider of Microsoft Teams is responsible for data processing. However, accessing the website is necessary only in order to download the software for using Microsoft Teams. In case one does not wish to or cannot access the Microsoft Teams app, one can also access Microsoft Teams by using one‘s browser. In this case, the service is also provided by the Microsoft Teams website.

Legal bases in general
If personal data is processed by employees of Keller Lufttechnik GmbH + Co. KG, § 26 BDSG is the legal basis for such data processing. If, in connection with using Microsoft Teams, personal data is not required for the establishment, performance or termination of employment, but is nevertheless a fundamental component of the use of Microsoft Teams, Art. 6, Par.1, letter f) DSGVO is the legal basis for such data processing. In these cases we are interested in the efficient performance of online meetings.

Furthermore, the legal basis for data processing during the conduct of online meetings is Art. 6, Par.1, letter b) DSGVO, provided the meetings are conducted within the context of existing contractual relationships.
If no contractual relationship exists, the legal basis is Art. 6, Par.1, letter f) DSGVO. Here too, we are interested in the productivity of online meetings.

Which data is processed?
When using Microsoft Teams, a variety of data is processed. The extent of the data depends on the information provided prior to or during participation in an online meeting.

The following personal data is subject to processing:
•    User details: e.g., displayed name, e-mail address (if applicable), profile photo (optional), preferred language
•    Meeting metadata: e.g., date, time, meeting ID, phone numbers, location
•    Text, audio and video data: You may be able to use the chat function during an online meeting. To this end, any text entries submitted will be processed in order to display them during the online meeting. To enable the presentation of videos and the playback of audio, the data from the microphone of the terminal device as well as from a connected video camera will be processed for the duration of the meeting. Users may opt to turn off the camera or mute the microphone themselves at any time by using the Microsoft Teams applications.

Scope of data processing
Keller Lufttechnik uses Microsoft teams to organize online meetings. If online meetings are to be recorded, this is communicated transparently in advance and, if necessary, consent is requested.

The chat content is logged when using Microsoft Teams. Files that users share during chats are stored in the OneDrive for Business account of the user who shared the file. Files that team members share in a channel are stored on the team's SharePoint site.

Automated decision making as defined by article 22 DSGVO is not used.

Personal data processed in connection with participation in online meetings is generally not passed on to third parties, unless it is specifically intended to be so disclosed. Please note that content from online meetings, as well as personal meetings, is often used to communicate information with customers, interested parties or third parties and is, therefore, intended for disclosure.
Other recipients: The provider of Microsoft Teams necessarily obtains knowledge of the above-mentioned data to the extent that this is provided for in our contractual processing agreement with Microsoft Teams.

Data processing outside the European Union
Data processing outside the European Union (EU) does not take place as a matter of principle, since we have limited our storage location to data centers within the European Union. However, we cannot exclude the potential option that data may be routed via Internet servers located outside the EU. This may be the case in particular if participants in online meetings are located in a third country.

However, the data is encrypted by Microsoft during transmission over the cloud, and is, therefore, protected from unauthorized access by third parties.

Deletion of data
As a matter of principle, we delete personal data when there is no further need for storage. A requirement can exist in particular if the data is still required in order to fulfill contractual obligations, to examine and grant or to be able to settle warranties and, if applicable, guarantee claims. In the case of legal storage obligations, deletion shall only be considered after the expiry of the respective storage requirement.

Further information on data protection at Microsoft Corporation
For additional information, please access the links provided below:

Your rights

You have the right:

  • to demand information about any personal data processed by us, in accordance with  Art. 15, DSGVO.  In particular, you can request information about the purpose of the use of your personal data, types of recipients to whom your data was disclosed, the planned retention period, the right to correct, delete, or restrict access to your data , the right to request the source of your data if it was not collected by us, and demand the specifics of any automated decision- making functions such as customer profiling,  as well as any other material information;
  • to request the immediate correction of any erroneous personal data stored by us, in accordance with Art. 16 DSGVO;
  • to demand, according to Art. 17 DSGVO, the deletion of personal data stored by us, unless it is required by us for the purposes of exercising the right of freedom of expression or information, to fulfill any legal obligations that may be in the public interest, or for the assertion, execution or in defense of any legal claims;
  • to restrict the processing of your data according to Art. 18 DSGVO – if the accuracy of the data is denied by you, if the processing was illegal but you refuse its deletion because you need it in order to assert, execute or defend your legal rights, or if you have filed an objection according to Art. 21 DSGVO;
  • to request your personal data that you have provided to us, in a structured, common and machine-readable format,  according to Art. 20 DSGVO,  or to request transmission to another responsible party;
  • to revoke a previously submitted approval at any time, according to Art. 7 Abs. 3 DSGVO. This means that we must discontinue processing data which is based upon a previous approval, and
  • according to Art. 77 DSGVO – you have the right to lodge a complaint with a supervisory authority. As a rule, you may contact the supervisory authorities for your place of residence, for your workplace, or for our headquarters site.

If your personal data is processed on the basis of a legitimate interest according to Art. 6 Abs. 1 S. 1 lit. f DSGVO, you retain the right – according to Art. 21 DSGVO – to enter an objection against the processing of your personal data, provided there are valid reasons relating to a special situation, or if you object to any form of direct mail advertisement. In the latter case, you have a general right to enter an objection which is executed by us without you having to divulge your particular situation.

If you wish to exercise your right to lodge a complaint, please send an e-mail to [email protected]