Gleneagles Community Center / Patkau Architects; West Van. Ventilation is accomplished using a displacement system. 100% fresh air is tempered and supplied at low velocity at low levels. This air rises, flushing contaminants upward, where it is then captured and exhausted through a heat recovery ventilator. Since air is not being used as a medium for climate control, opening windows and doors does not affect the performance of the heating and cooling system.