Swine confinement buildings often do not have appropriate technologies to reduce the level of respirable indoor environmental contamination. A major cause of this environmental contamination is dust from feed, faecal material, molds, etc. Other causes include endotoxins and gases, such as ammonia, hydrogen sulfide, methane, carbon dioxide and carbon monoxide. The goal is to first control these pollutants at the source, second, eliminate them once they are in the air and finally wearing dust masks or other such equipment to further reduce an individuala