Except as provided in §§C and D of this regulation, an employer shall provide shaded areas to exposed employees as close to the work area as practicable. Shaded areas shall: Be outside, open, and exposed to air on at least three sides; Prevent contributing heat sources from reducing effectiveness; Be sufficiently sized for the number of employees utilizing the shaded area; Be arranged in a configuration that allows employees to sit in normal posture; and Accommodate the removal and storage of personal protective equipment during periods of use. If creating outdoor shade is demonstrably infeasible or unsafe in the work area, the employer shall implement alternative cooling and control measures that provide equivalent protection to shade. An employer may provide cooling with an indoor mechanical ventilation system as an alternative to outdoor shade provided that the indoor space satisfies the requirements of §B(2)—(5) of this regulation.