--- title: Long term trial Lepido – Heat recovery from polluted extraction systems without pre-filtration or maintenance description: Heat recovery from polluted extraction systems, without pre-filtration or maintenance. Download the results from our long-term test at Burger King and see the results for yourself image: https://landing.enjaysystems.com/hubfs/Canva%20images/Canva%20Design%20DAFLuRRwodY.png --- # Long term trial: Lepido – Heat recovery from polluted extraction systems without pre-filtration or maintenance ![](https://landing.enjaysystems.com/hs-fs/hubfs/Canva%20images/Canva%20Design%20DAFLuRRwodY.png?width=2240&height=1260&name=Canva%20Design%20DAFLuRRwodY.png) ![](https://landing.enjaysystems.com/hs-fs/hubfs/Picture1.jpg?width=1392&height=1046&name=Picture1.jpg) ## Download the results from our long-term test at Burger King and see the results for yourself **Project data:** **Period:** 2020-09-01 – 2022-08-01 (22 months) Site: Burger King, Bulltofta, Malmö Operating hours: 16h/dygn Air flow exhaust air: 1,02m3 /s Air flow make-up air: 2,0m3 /s Temperature exhaust air: 34°C  Temperature set-point make-up air: 16°C Lepido unit: L12-14.30 [Download results ](https://enjaysystems.com/hubfs/Website%20files/22%20month%20long%20trial%20Lepido.pdf)