The following workplaces and operations are fully exempt from the requirements:
(A) Incidental heat exposures where an employee is not required to perform work activities for more than 15 minutes in any sixty-minute period.
(B) Exposures to heat generated from the work process, such as occurs in bakeries, is not subject to this standard. In such cases, employers must follow the requirements of OAR 437-002-0144(2).
(C) All emergency operations that are directly involved in the protection of life or property, or the restoration of essential services, such as evacuation, rescue, medical, structural firefighting, law enforcement, utilities, and communications.
(D) Buildings and structures that have a mechanical ventilation system that keeps the heat index below 80 degrees F.
The following workplaces and operations are partially exempt from the requirements:
Employees who only perform either rest or light workloads such as office work or driving, are exempt from this rule only when the heat index is less than 90 degrees F.
At OSU, it will be assumed that for buildings without a temperature controlled mechanical cooling system, the inside heat index will be equivalent to the outside heat index. For high humidity environments without mechanical cooling such as in greenhouses, the humidity must be measured to determine the heat index.