Norrel delivers a complete, fit for purpose waste heat recovery system, the ThermStar System™. ThermStar is engineered for tough industrial and commercial ventilation environments. At the heart of the system is Lepido™, a rugged heat exchanger built specifically to operate in polluted exhaust air, where traditional systems clog or fail.
Our system reclaims thermal energy from air streams contaminated with grease, soot, lint, or moisture, and transfers that heat into usable energy, typically to preheat incoming air or water, without disrupting your existing processes.
Norrel’s ThermStar System™ combines the power of the Lepido™ unit with a fully integrated solution:
This turnkey solution is designed for fast deployment and long-term reliability by preferred mechanical contractors using our installation guidelines.
Recovers heat from humid, lint and detergent laden exhaust streams in tunnel washers, tumble dryers, and finishing equipment.
See how CWS Workwear uses Lepido to cut energy costs.
Handles grease, steam, and particulates in food production and restaurant exhaust from industrial snack lines to quick-service kitchens.
Case studies: Burger King, Lantmännen Pancake Factory.
Ideal for thermal exhaust in textiles, polymers, foundries, and beyond including challenging contaminants like fibers, resins, and dust.
Explore Sports & Leisure Group and Bruzaholms Foundry.
Reclaim Waste Heat. Energy Savings Delivered
Lepido™ is a patented Swedish innovation developed by Enjay Systems AB, the only heat recovery unit engineered specifically to recover energy from polluted exhaust air. Now available in North America exclusively through Norrel Inc., Lepido forms the heart of our ThermStar System™, turning wasted heat into clean, usable energy for commercial and industrial operations.
In environments like industrial laundries, food processing plants, drying operations, and commercial kitchens, exhaust air is hot, humid, and filled with grease, soot, lint, or chemicals. These conditions quickly clog and render inoperable conventional heat exchangers, but not Lepido™.
Purpose-designed for industrial airstreams contaminated with grease, moisture, lint, or chemical particulates, Lepido™ features rugged, corrosion-resistant materials and a durable form factor engineered to perform in the toughest conditions, 24/7 and all year long
Traditional exchangers clog quickly, but Lepido’s patented Particle Repellent Geometry (PRG®) slows down particulate buildup, preserving high thermal efficiency and reducing maintenance frequency, even in dirty, grease laden exhaust.
Recovers up to 60% of thermal energy, sometimes more, redirecting it to preheat process air, hot water, or HVAC systems. The result: lower energy bills, lower emissions, and faster ROI
Particle Repellent Geometry (PRG), reclaiming waste heat in environments where others can’t.
Unlike traditional heat exchangers that rely on tightly spaced fins, Lepido features a finless, open coil design that works with the natural flow of contaminated air.
Grease, soot, moisture, and other particles pass through the exchanger without clogging or sticking to the surface. This drastically reduces buildup, pressure drop, and the need for frequent maintenance.
Its larger structure allows for ample spacing between coils, creating a unique airflow pattern where particles are repelled rather than trapped. Despite its open design, Lepido maintains the same heat transfer surface area as conventional systems by using 100% counter-current flow and multiple fluid patterns.
Long lasting performance, substantial energy recovery, even in the harshest industrial environments.
Reclaim Waste Heat. Energy Savings Delivered
