An electrostatic precipitator in conjuction with a recirculation duct was developed to remove airborne swine dust from an environmental chamber at the University of Alberta. The collection efficiency of the electrostatic precipitator was evaluated at varying applied voltage and airspeed levels. The three applied voltage levels were: -10.3, -11.0 and -12.1 kVDC. The three airspeed levels were 0.55, 0.76 and 0.95 m/s. The overall collection efficiency of the precipitator ranged from 18.5% at an applied voltage of -10.2 kVDC to 96.4% at an applied voltage of -12.0 kVDC. Applied voltage had a significant effect (P<0.05) on collection efficiency. Airspeed did not have a significant effect (P<0.05) on collection efficiency. The optimal airspeed was 0.76 m/s for all applied voltages. Collection efficiency increased by approximately 5% when the precipitator length was increased by 50%. Inter-electrode spacing had little effect on collection efficiency. An applied voltage of -12.1 kVDC produced ozone level of 0.21 ppm which exceeded the recommended TLV of 0.1 ppm.