Air is usually discharged through particulate filter elements hepa ulpa as final filters the highest air cleanliness classes can be achieved with a low turbulence laminar flow even in large clean room areas the average airflow velocities are usually between 02 and 05 m s in other words the air in the clean room zone is. By doing so the air quality in the occupied zone is generally superior to that achieved with mixing room air distribution since the conditioned air is supplied directly into the occupied space supply air temperatures must be higher than mixing systems usually above 63 f or 17 c to avoid cold draughts at the floor by introducing the air at supply air temperatures close to the room . Gives laboratory obtained data which emphasise possible changes in air distribution by variable volume delivery from this selection procedures can be considered our outlets in interior and perimeter. It is hoped that the theme of roomvent 2000 ventilation for health and sustainable environment will set the scene for room air distribution research and development for the new millennium readership for engineering and designers interested in room air distribution and ventilation table of contents volume i preface programme and organizing comittee international scientific committee co . Experiments with air distribution in rooms generated by a low impulse textile terminal are compared with the air distribution obtained by mixing ventilation and displacement ventilation the air