The German Institute of passive housing (PHI) is an independent research institution, which has played a key role in the development of the concept of passive housing. After nearly two decades of development, Phi has become an internationally recognized authoritative research institution for performance-based building energy standards. In order to ensure the construction quality, Phi has formed a set of strict passive housing certification standard system, and set up three groups of certification for buildings, components and personnel.

Let’s briefly interpret the key data of the phi certificate of the component (spacer bar)