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Energy efficient restaurant ventilation systems

July 2020
Gallery Lepido 1
Gallery Lepido 1


Enjay is a Swedish cleantech company, specialized in energy efficiency, who developed Lepido, one of the first energy recovery solution from restaurant ventilation.

This innovation enables to reduce annual emissions of CO2 by 500 million metric tons, representing 1% of the projected worldwide CO2 emissions by 2050. Lepido is a self-cleaning recovery coil, adapted for restaurant ventilation, which allows restaurants to benefit from their ventilation instead of wasting energy. Lepido's delivered effect per converted restaurant varies from 17 to 106 kilowatts, lowering the average annual emissions of CO2 by circa 34 metric tons. Lepido's system is maintenance-free, meaning that every kilowatt-hour recycled is a real financial saving. Thanks to Lepido's highly scalable technology, property owners worldwide can simultaneously save money and reduce their impact on the environment.

Label Date July 13, 2020
From Sweden
Maturity stage Medium and large scale commercialization

Implementation Stories

Lepido by Enjay AB
Implemented by Burger King Scandinavia in Malmö (Sweden) in 2021

Burger King restaurants in Scandinavia approached the cleantech company for the implementation of the Lepido unit. From now on, all future 250 Scandinavian Burger King restaurants will utilize the Solution, to help the restaurant chain lower both CO2 emissions and operating expenditure. Lepido is now included in the standard design for all new Burger King restaurants started by King Foods in Scandinavia.


Expected decrease of 2,5 metric tonnes of co2 per restaurant per year


The environmental benefits

  • A profitable and efficient way to recover energy from restaurant ventilation.
  • Results in monetary savings for property owners and up to a 1 percent decrease in global CO2 emissions.
  • Delivered effect per converted restaurant varies from 17 to 106 kilowatts, lowering the average annual emissions of CO2 by circa 34 metric tons

The Financial benefits

  • Payback time in years for your client ROI off Lepido is 2-4 years, depending on size and operating hours
  • Average savings over lifetime (20 years): 2.000.000 kWhs

Activity Region

  • /



  • Headquarters
  • Activity

Company Profile

Enjay AB

Enjay is a Swedish cleantech company, specialized in energy efficiency. The company´s first solution, Lepido, is the first to offer profitable energy recycling from restaurant ventilation. Our overall mission is to put an end to wasting energy, because the cleanest form of energy is the one never produced.

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Headquarters 213 76 Malmö, Sverige

Networking Partner

International Cleantech Network

The International Cleantech Network (ICN) is a global network of 13 cleantech clusters on the international forefront of providing innovative and sustainable solutions to meet the growing demand for green technologies.

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Solutions Associated 83

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The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator Enjay AB has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.