Zero-barrier and universal designs are requirements that are being stressed when planning and executing construction projects. The zero-barrier threshold allows free passage through doors, also enabling access for people with disabilities. This eliminates the limitations caused by the installation position of the entrance doors, which is often unprotected from wind and rain, and therefore requires technically unavoidable threshold variants. The innovative heroal zero-barrier can be used for commercial and front doors that open inwards and outwards. The heroal D 72 door system with the integrated zero-barrier threshold combined with the new heroal DS drainage system provides a system solution for any weather condition.