Any outlet for air that protrudes through the roof deck - such as a pipe or stack. Any device installed on the roof - gable - or soffit for the purpose of ventilating the underside of the roof deck.

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1. Any outlet for air that protrudes through the roof deck - such as a pipe or stack. Any device installed on the roof - gable - or soffit for the purpose of ventilating the underside of the roof deck.