The paper presents a ventilation comfort chart that has been developed under Thailand climate and using Thai volunteers. 183 male and 105 female college-age subjects were exposed to different thermal conditions in order to investigate the effect of air velocity on thermal comfort in ventilated "non-conditioned" spaces. To this end, commercial electric fans were used to control the air velocity near the subjects. The air velocity varied between 0.2 and 3 m/s. Room conditions varied between 26 degrees C and 36 degrees C (D.B.T.) and 50-80% relative humidity. Thermal sensation vote was recorded through a questionnaire. The Predicted Mean Vote was used to determine the indoor neutral temperature. This developed chart could be used to design ventilation system for offices and classrooms.