A space with a sloped ceiling is to be naturally ventilated from a single side. The ceiling height at the wall with the operable opening is 8 feet. Within 20 feet of the opening, the ceiling slopes upward to a height of 16 feet. What ceiling height (H) should be used to calculate the maximum ventilated depth per Section 402.2.1.1?

• 8 feet (the minimum height)
• 16 feet (the maximum height within 20 ft)
• 12 feet (the average height within 20 ft)
• The height at the midpoint, 10 feet