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- The world’s first Passive House, Darmstadt-Kranichstein, Germany
- ystematically varied and optimised in relation to efficiency, expense and living quality. As an example, __**... tive architectural drafts were prepared, * the efficiency of ventilation heat recovery units was improved, ... bathrooms in corresponding quantities. Such high-efficiency ventilation systems had not been available before... the following characteristics: * heat recovery efficiency of more than 80%, * electricity consumption of