A 2-inch diameter individual vent must extend through a roof. What is the minimum required height above the roof for this vent terminal, and what is the exception for pitched roofs?

• 18 inches above the roof in all cases.
• 12 inches above the roof, except on flat roofs where it can be 6 inches.
• 6 inches above the roof, or 12 inches above anticipated snow, except if the roof is used for other purposes it must be 7 feet.
• 6 inches above the roof, with no exception for pitched roofs.