For four years, Vacuumschmelze GmbH & Co. KG (VAC), Germany, has been using a regenerative condensation process for cleaning the off-gas at a 20-roll cold rolling mill. Considered worldwide as an environmental pioneering step in 2007, today, the investment has proved to be very profitable. And not only that: after four years of operation, the cold rolling stand and the off-gas cleaning system have also demonstrated constantly high availability and contributed to sustainable energy efficiency.