The Promise of Clean Air

We design, supply and install customer specified plants and systems for demanding industrial sectors. LESNI purifies the air of irritating odour emissions, toxic gases, solvents, dust and aggressive agents.



In calendar weeks 29 and 30 will our office in Billund be closed except for emergency staff.


LESNI Catalytic Abatement Plants are Ready for the New Ethylene Oxide Regulations, and Picarro Monitoring Systems Prove It


35 years LESNI

1987 - 2022

For 35 years LESNI has been developing and supplying highly complex air purification systems for cleaning of industrial exhaust air.

These LESNI tailor made systems are designed and engineered with customer specification in mind, to meet local and international legislations and standards with great emphasis to safety, reliability and energy conservation and are used as a precaution and to protect users, the neighborhood and the environment from harmful environmental effects from air pollution.

Our customers worldwide

Our plants are in operation all over the world to remove irritating odour and other toxic gases from industrial air.


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We can build the perfect custom solution for your business.

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Exhibition & Conferences

ACHEMA 2024 in Frankfurt, Germany

- 10th - 14th June 2024

MEDICA / COMPAMED 2024 in Düsseldorf, Germany

- 11th - 14th November 2024

LESNI EtO Excellence

From 3D to installation on site.

Explore our quality and click here: