This solar powered ventilation system is designed to provide efficient air circulation in your home or office. It utilizes the power of the sun to power a fan that circulates air throughout the space, helping to reduce humidity and improve air quality. The system is easy to install and requires no additional wiring or
From Wikipedia
A solar chimney – often referred to as a thermal chimney – is a way of improving the natural ventilation of buildings by using convection of air heated by passive solar energy. A simple description of a solar chimney is that of a vertical shaft utilizing solar energy to enhance the natural stack ventilation through a building.