Full Description ADOPTED_FROM:CEN/TR 17426:2019 This document describes the installation rules that must be followed to ensure proper functioning of the drainage system depending on the specified performance of the sanitary appliances. These performance characteristics of sanitary appliances (defined in the harmonized standards EN 997, EN 13407, EN 14688, EN 14528 and EN 14527) are explained and brought into line with the application rules of standard series EN 12056. According to Regulation (EU) 305/2011, legally binding information on building requirements must be provided by the National Product Information Point. Therefore, additional national requirements are mentioned informatively where information is available.