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Ancillary space / secondary use space
Ancillary or secondary use space (Nebennutzfläche – "NNF") is, under the terms of the SIA ordinance 416, the part of the usable space (Nutzfläche – "NF") that is supplementary to the main usable space (Hauptnutzfläche – "HNF").
In residential buildings, ancillary space includes areas such as utility rooms, attic and cellar space, store rooms, bunkers, and waste disposal amenities.
