R 325.52003 Definitions.

Rule 3. (1) "Aerosol" means particulate matter suspended in air. (2) "Contaminant" means an airborne material capable of causing occupational disease or significant physiological disturbances to a person, and includes, but is not limited to, the substances listed in Occupational Health Standard Part 301 “Air Contaminants for General Industry,” as referenced in R 325.52002. (3) "Control" means the limitation of worker exposure to contaminant levels not exceeding the exposure limits as set forth in Occupational Health Standard Part 301 “Air Contaminants for General Industry,” as referenced in R 325.52002. (4) "Controlled process" means an arrangement of equipment to control the contaminant by means of suitable design measures. (5) "Enclosure" means a room, booth, or exhaust hood that confines contaminants at their sources. (6) "Gas" means a normally formless fluid that occupies a space or enclosure and that can be changed to the liquid or solid state by the effect of increased pressure or decreased temperature, or both. (7) "General ventilation" means the supply and removal of air from a space to dilute or remove contaminants. (8) "Local exhaust ventilation system" means an arrangement of exhaust hoods, ducts, and fans that removes air to control a contaminant at its source. (9) "Mg/m3" means milligrams of particulate per cubic meter of air. (10) "Mppcf" means millions of particulates per cubic foot of air based on impinger samples counted by light field microscopic techniques. (11) "Ppm" means parts of vapor or gas per million parts of air by volume at 25 degrees Celsius and 760 millimeters of mercury pressure. (12) "Permissible exposure limits" means the exposure limits as set forth in Occupational Health Standard Part 301 “Air Contaminants for General Industry,” as referenced in R 325.52002. (13) "Process space" means a tunnel, process equipment, shaft, or enclosed space. (14) "Source" means a process or equipment that releases a contaminant into the air in concentrations exceeding the permissible exposure limits. (15) "Supply ventilation system" means an arrangement of inlet openings or equipment to introduce outside air into the working environment. (16) "Vapor" means the gaseous state of a substance.