This manual covers building damage due to air blasts in urban environment. It is based on the previously presented rule-of-thumb model. The objective of this manual is to provide a practical tool to enable quick assessments of building damages caused by explosions. This manual is not provided as building design guideline for structural engineers. It rather addresses a widespread audience like emergency measures personnel, governmental organizations conducting risk assessments or planners arranging security measures e.g. perimeter protection devices. The manual will be published on behalf of the Board of Experts for Military Infrastructure Protection, Swiss Federal Department of Defence, Civil Protection and Sport.