The Solarwall is a black perforated surface that extends from the exterior of the stair tower and creates an air cavity where air is heated from the sun and through convection creates a negative pressure in the cavity. Air is pulled through the labspace and the classroom via vents as seen below, which in turn pulls outside air through the earth tube. The earth tube cools and dehumidifies the hot humid outside air before entering the classroom. Earlier in the day before the sun completely heats the Solar wall fans actively pull the air from the earth tube. Temperature sensors tell the fans when to shut off and allow the passive system to take over for the majority of the day when cooling demand is high. In order for the system to work effectively all windows and doors in the lab and classroom must remain closed.