The Swedish innovation Lepido by Enjay, is a heavy duty heat exchanger developed specifically for polluted airstreams. Using Lepido makes energy recovery from hostile environments not only possible, but also profitable.

Why heavy duty?

In challenging ventilation environments like restaurant kitchens – just look at the pictures below - you need a heavy-duty solution to handle all that soot and grease. So, we’ve invented Lepido, the world’s first heavy-duty heat exchanger that can handle the dirt - a solution that can finally make energy recovery in challenging environments both possible and profitable.

A number of Lepidos are already up and running in restaurants, hotels and schools throughout Europe, and they deliver perfectly, saving an average of 85.000 kWh per year, which means saving money, energy and CO2 emissions every day!
Explainer video

How it works


Our Patent

Particle Repellent Geometry

Lepido recovers energy from polluted airstreams with up to 68% efficiency thanks to our patented Particle Repellent Geometry  (PRG®)

How PRG works

Lepido, being a heavy-duty heat exchanger, is larger compared to a traditional heat exchanger to make room for our patented geometry of the recovery coils. The space between the coils is much larger than between fins of a traditional heat exchanger.

The result is a unique airflow pattern where most of the particles can pass through the heat exchanger instead of sticking to the coils. This slows down the build-up on the coils and makes the air pressure drop minimal, even if a coating has formed.

Lepido, being coil-based with one hundred percent counter-current and multiple fluid patterns, has the same heat transmission element surface area as a traditional heat exchanger.


Particle Repellent Geometry

The aerodynamic configuration of the recovery coil causes the majority of the particles of grease and soot to pass through the unit without getting stuck to the coils.
Product Data
Brine connections
Counterflow configured brine connections
Universal fitting. Bolted joint or clinch slide guide joined.
Particle Repellent Geometry. The aerodynamic configuration of the coils allows the majority of the particles to pass straight through the battery, without getting stuck to the coils.
Follows the most stringent fire protection regulations. All stainless steel, durable as the house it’s situated in. The housing is simply a part of the grease duct; Installation made easy.
Drains continuous condensation as well as the minuscule amount of grease released by the APC. The grease drains down to the restaurant’s grease trap.
  • Use cases

    Areas of usage

    Lepido, designed to operate robustly in polluted air streams, can be deployed in a wide range of different process ventilation systems. The pollutants may vary, and – to name a few examples – range from grease and soot in restaurant ventilation, to wax and lint in industrial laundries, to residual lackard and sawdust in woodworking industries and back to grease and water vapour in food processing and snacks production. The Particle Repellent Geometry is created to utilize natural forces to Lepido’s advantage, and natural forces are universal, affecting all pollutant particles the same way. It is these technological advances and physical properties that give Lepido the advantage in polluted air streams, allowing for the majority of particles to simply pass straight through the heat exchanger, without getting stuck.

    For example,

    • Restaurants
    • Fast food restaurants
    • Laundries
    • Food processing
    • Woodworking
    • Chemical industries
    • Food Courts