R 325.52005 Supply ventilation systems.

Rule 5. (1) An employer shall provide a supply ventilation system to ensure a flow of air into the working environment to equally replace the volume of air exhausted. (2) An employer shall provide a mechanical air supply system if its absence will result in building negative pressures sufficient to cause back-drafting of vents from fuel- fired equipment or ineffective control. (3) Mechanical air supply volumes shall be heated to maintain a minimum air temperature of 65 degrees Fahrenheit measured at the point of air discharge to the space. Exceptions to this requirement are refrigerated storage rooms, special process rooms, and similar locations where low air temperatures are essential to the preservation of the product or service, or, if in the opinion of the director, a lower air temperature will not be harmful to the health of the persons affected. (4) Make-up air for spray-finishing operations shall be as prescribed in General Industry Safety Standard Part 76 “Spray Finishing Using Flammable and Combustible Materials,” as referenced in R 325.52002. (5) Make-up air for open surface tanks shall be as prescribed in Occupational Health Standard Part 526 “Dipping and Coating Operations,” as referenced in R 325.52002.