Disposable respirators and face masks are single-use products that protect against dust particles, fluid splashes and airborne illnesses. Dust masks filter dusty air in sanding and grinding applications. They often have filters that expel hot, moist air to keep workers cool. Surgical masks capture bacteria and prevent nose and mouth contact with an ill person's bodily fluids. Their three-ply design prevents the spread of airborne illnesses. They are worn by health professionals as well as individuals with an infectious disease.