Company

Innovation, high-performance solutions and the highest quality are our strongest motivators. Because precision is our passion. 

Your contact person

Get to know the team

Management

Oliver Hennen

Management

Administration

Hermann Sonnen

Administrative Manager

Operations Manager

Andreas Welther

Technical Operations Manager

Sales

André Haag

Sales / Field service

Sales

Mona Douale

Sales Assistance French correspondence

Ventilation ducts

Sascha Brunner

Ventilation duct construction Scheduling

Special part construction

David Rohleder

Special parts construction Scheduling

a career with us

Start with us in your dream job

Our motto: The perfect workflow from design to production in our high-tech machinery.
We combine not only the best quality and reliability, but also an innovative and dynamic corporate culture. You too can become part of our well-coordinated team. 

our history

The company history

1999

Foundation by Hermann Hennen

Hermann Hennen, a graduate engineer, founds BLH GmbH with an initial staff of 23 to serve the local ventilation technology market.

2016

Change of management Oliver Hennen

Hermann Hennen retires and Oliver Hennen takes over the management. At the same time, the SIG Air Handling Group becomes a shareholder in the company.

2020

Extension of the new hall

In order to meet the strong demand for individual special constructions, a new production hall with 2000 m² is built. Here, well-trained employees can work on high-quality products on modern CNC machines and welding workstations.

2005

Expansion and move to the Pfalzel site

With almost 50 employees in the meantime, the space in the rented hall soon becomes too tight. With the new building on the greenfield site, the workflow can be improved and space created for future expansions.

2019

20th anniversary

With now more than 90 employees and Europe-wide activity, BLH has positioned itself as one of the leading suppliers of metal ventilation products on the market.

2020

Airvance Group

The Europe-wide Airvance Group with 1650 employees takes over the SIG Air Handling Group and thus also BLH GmbH. This allows BLH to benefit from group structures while continuing to respond to local customer needs.

1999

Foundation by Herrmann Hennen

Hermann Hennen, a graduate engineer, founds BLH GmbH with an initial staff of 23 to serve the local ventilation technology market.

2005

Expansion and move to Pfalzel site

With now more than 90 employees and Europe-wide activity, BLH has positioned itself as one of the leading suppliers of metal ventilation products on the market.

2016

Change of management Oliver Hennen

With almost 50 employees in the meantime, the space in the rented hall soon became too tight. The new building on the greenfield site improved the production flow and created space for future expansions.

2019

20th anniversary

In order to meet the strong demand for individual special constructions, a new production hall with 2000 m² is built. Here, well-trained employees can work on high-quality products on modern CNC machines and welding workstations.

2020

New hall extension

Hermann Hennen retires and Oliver Hennen takes over the management. At the same time, the SIG Air Handling Group becomes a shareholder in the company.

2020

Airvance Group

The Europe-wide Airvance Group with 1650 employees takes over the SIG Air Handling Group and thus also BLH GmbH. This allows BLH to benefit from group structures while continuing to respond to local customer needs.

1999

Foundation by Herrmann Hennen

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2016

Change of management Oliver Hennen

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2020

New hall extension

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2005

Expansion and move to Pfalzel site

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2019

20th anniversary

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2020

Airvance Group

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we are part of the

Airvance group Logo | BLH Lüftungstechnik Hennen

The Europe-wide Airvance Group with 1650 employees takes over the SIG Air Handling Group and thus also BLH GmbH. This allows BLH to benefit from group structures while continuing to respond to local customer needs.

corporate values

This is what we stand for as a company.

Reliability

You can rely on us - because we keep our promises. In doing so, we focus our actions on sustainable, cooperative partnerships.

Quality

We focus on unique quality in the production of our innovative solutions. Likewise, we invest in a qualitative future thanks to our instructive trainings.

Responsibility

We take responsibility for our employees and our environment. Therefore, we act sustainably in the sense of a resource-rich future.

We ensure clean air.
We believe in quality work.
We work for our customers.

achievements
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Projects

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Employees

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Projects

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