Key Featureshttp://www.powerwind.com.tw This invention is a natural ventilation system that can efficiently remove airthrough an indoor space. The fundamental design is the hollow base has deflectors and flashings covering its exterior and top. The outer of the base interval has several pieces of fairings which are opposite shape from the deflectors perfectly working together to make a room for removing indoor air to outside of building. Its excellent exhaust improves to solve the past problems of wind resistance and negative air turbulence. The patented invention creates effective air convection for buildings. It subject to high temperatures and high humidity in summer, natural ventilation removes indoor moisture and lowers perceived temperature, securing comfort and health.