Wood burning stoves that are DIBt-certified, meaning they have been officially tested and approved by the Deutsches Institut für Bautechnik (DIBt) for room-air-independent operation. Stoves with this certification meet strict German safety, combustion, and airtightness standards, making them suitable for airtight homes, including those with MVHR or Passive House systems. Only specific models or variants with an active DIBt certificate should carry this tag.