A draft quantity through a ventilated air space is analyzed by numberical calculation and model experiment, and a correlation between the draft quanitty and buoyancy, following a temperature difference between the ventilated aire space and circumference, is discussed. At first, a dimensionless theoretical analysis method for the draft quantity is shown, and a relation between a dimensionless draft quantity and dimensionless height L/(bG_e) of ventilated. As the results, it is made clear that the draft quantity shows a proportional relationship wiht the temeprature dimensioless draft quantity can be expressed as a function of the dimensionless number (b/l)G_eP_r.
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