This design manual DM-11.02, Cooling Buildings by Natural Ventilation, provides guidance and criteria for the design of buildings to be totally or partially cooled by natural ventilation. It describes several natural cooling strategies and concerns related to their implementation; comfort criteria; design criteria for natural ventilation and for zoned or seasonal combinations; building design features and practices; recommendations for occupant and maintenance manuals, and guidelines for wind tunnel testing. Appendices describe the fundamental principles of comfort related to airflow, a methodology for climate analysis, prediction and evaluation methods, forms and overlays for the designers' use, and a selective bibliography.