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This document has been prepared by Working Group NA 031-02-01-02 AK "Planung, Instandhaltung, Montage" ("Planning, Maintenance, Installation") of Working Committee NA 031-02-01 AA "Brandmelde- und Feueralarmanlagen" ("Fire detection and fire alarm systems") of Standards Committee Firefighting and Fire Protection (FNFW). This document contains additional information on DIN 14675:2012-04, "Fire detection and fire alarm systems - Design and operation". NA 031-02-01-02 AK which is the working group responsible for this document has developed the recommendations for use described in this document within the scope of its interpretation obligation. The following paragraphs have been numbered in accordance with DIN 14675:2012-04 and contain additional information.