standing . when an occupant is standing ,inhalation residual lifetime is shorter in the area from the mouth to the lower area as is shown in .it is clear that the fresh air from the supply opening enters the region of inhalation,drawn upward by the thermal resulting from metabolic heating.the air in the region extending from the head to the exhaust opening hardly reaches the region of inhalation at all,but moves away towards the exhaust opening .interestingly,the distribution of residual lifetime for air to be inhaled correspond inversely to that of IECI. in the region of higher IECI ,the residual lifetime for air to be inhaled is shorter