Passive cooling and de-humidification based on simple Delta T technology. Hot air rises and if you create a vacuum then you can pull cool air into hot areas (without the aid of electricity) simply by installing vents strategically. This system shows an underground system and assumes that the viewer understand some principles of plumbing and gravity to prevent water incursion into the structure. See other videos for roof venting. For basic concepts of passive cooling systems please check out the research of our friend, Virginia Macdonald FAIA