Abstract
1. In order to calculate natural ventilation of roof monitor equied with the block of factorys which is caused by wind, we made wind tunnel experiment using the model of the block of 5 factorys which have J type roof monitor (see fig. 2), and obtained its ventilating property in natural wind. 2. Calculation of ventilating volume of roof monitor is followed the same equation in report 1. 3. This experimental study is made using about 1/400 model of factory, and indicated monitors value of pressure loss coefficent ζ_<m0*gt; and wind pressure coefficient C_<m0> when wind direction θ changed. These result is indicated Fig. 5〜8.
