Lindab and Castellum are collaborating on duct systems in fossil-free steel for a renovation project in Stockholm, Sweden. Lindab is the first ventilation company in the world to receive a pilot delivery of fossil-free steel from SSAB. Castellum is significantly reducing the project's climate impact by choosing fossil-free ventilation ducts for its refurbishing.

The majority of Castellum's climate impact comes from construction projects. To reduce the climate footprint, there is a major focus on using climate-efficient methods, products, and materials in renovations and new construction projects. In a renovation project, an average of 50-80% of the climate impact come from technical installations, with the ventilation system accounting for the large share.

The property in Stockholm, Sweden, is a building from the 1960s. When the opportunity arose to use duct systems made of fossil-free material with the same technical properties and highest tightness class, it was an obvious choice for Castellum in the project. The property will be ready for tenant occupancy in June 2024.

The fossil-free steel comes from SSAB and is produced using the HYBRIT® technology. As a selected partner, Lindab has been given access to a pilot delivery, which makes it possible to deliver products several years before the planned regular production of fossil-free steel, which is expected to take place in 2026. Lindab offers ventilation ducts in recycled steel as part of its standard range and ventilation ducts in fossil-free steel to selected customers who can take advantage of the pilot delivery from SSAB.