A standard ventilation system was modified to reduce dust levels in a room with weaned piglets. It was based on the assumptions that it is important to minimize exposure of stockmen to dust in livestock confinement buildings and that airborne particles are largely re-entrained sedimented particles agitated by animal activity. The air inlet was located near nose height of stockmen, the air outlet was located neat the re-entrainment area, underneath the slats. Ventilation rates were established using rate-of-decay tracer gas measurements. In a direct comparison with an identical room the average inhalable dust levels measured continuously over 24 hour periods at 1.6 m on the feed walk were 40% reduced. The average inhalable dust levels at 1.0 m above the laying area was 50% lower in the room with the modified ventilation compared to the standard room. Sedimentation rates measured at different heights decreased with increased height. Sedimentation rates were proportional to airborne dust concentrations and varied between 500 and 2700 mg/m2 per day. Animal performance showed no significant differences. The results are important because it shows that without additional costs the dust exposure of stockmen can be reduced with 40%.