In Lübeck, Germany, the Baltic School underwent a major renovation to accommodate 1,060 pupils in a modern, energy-efficient environment. The upgrade included triple-glazed windows, high-grade insulation, and advanced building services—laying the groundwork for a comfortable indoor climate year-round.
Passive cooling with a secure twist
While insulation simplifies winter heating, it complicates summer cooling. To tackle this, venetian blinds were installed on the south-facing façades to reduce solar gain. At night, when temperatures drop, classrooms are cooled via Renson’s 431 RC2 wall louvres—an elegant, secure solution that allows fresh air in while keeping insects and intruders out.
Design meets durability
Behind each louvre lies a standard window, discreetly operable from the inside. The RC2 classification ensures resistance against forced entry using tools like screwdrivers or pliers. Each louvre unit comprises tightly riveted blade packs, tested to withstand heavy rain and storms—guaranteeing ventilation without moisture ingress.
Efficient ventilation, thoughtfully placed
With a free airflow of 40.5%, the louvres provide effective cross-ventilation. Two units per classroom, placed diagonally, ensure optimal air circulation. The entire €7 million project was funded by the Lübeck Possehl Foundation and executed by the city’s building management.