Dear clients, dear partners, Deltrian is celebrating its half-century of existence this year…

Deltrian’s story began almost 50 years ago. From the very beginning, the company, founded by Klaus Alexius, specialized in the filtration and ventilation sector, with a robust commercial activity. The industry was rewarding, and the Charleroi-based institution developed an expertise in strategic research and development in its quest for more advanced technological solutions. The company’s activities saw a turn just after the second generation took over in 1996. It decided to enter in the development and production of its own line of filters.

International expansion

Deltrian expanded on an international scale with great success. Activity in France started in 2001, where their business dealings established trust and a close relationship with their clients. In 2008, they developed their production facility in Slovakia, in the heart of Europe. They then opened the company up to additional markets in the East, notably Russia.

Since 2012, Deltrian is opening up more and more to the world and is succeeding with great success in Holland, where the exceptional growth is a symbol of the recognition we receive from our clients in a challenging market. Markedly, Deltrian is pursuing adventure in Italy, by opening a subsidiary in Milan.

After Holland and Italy, Deltrian opened its doors in Germany, the birth country of the company’s founder. Finally, it decided to broaden its horizons by establishing sites in China and Morocco.

We innovate for your future

The satisfaction of our clients has always been at the center of our operations. Our team stands out thanks to the flexible solutions we provide, which correctly address the unique needs of our customers. In 2015, we consolidated our expertise and our capabilities to further respond to the needs of our clients by investing in a new factory and production equipment.

Our values

Customer Focus

We listen to our clients. We meet their expectations and we do our best to satisfy their needs.


We are responsible. We say what we do and do what we say. We are well organized in order to get the best results.

Strive for Excellence

We work in continuous improvement. We learn from things and questions ourselves. We strive for excellence to exceed clients expectations.


In all interactions with our clients, colleagues and other ...
Honesty, respect and trust are the keywords.

Passion & Devotion

We are brave entrepreneurs, we dare to experiment and venture.
The sky is the limit !


Jürgen Alexius


I'am working with passion at Deltrian since 31 years.

Bernard Medros


I joined the Deltrian adventure 16 years ago.