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FGC § 501.17.1
Type B vents shall not be considered exposed to the outdoors in the following conditions: 1. A type B vent of a listed chimney system passing through an unused masonry chimney provided with a sealed cap that prevents airflow within the confines of the masonry chimney; or 2. A type B vent passing through an unventilated enclosure or chase insulated to R-8.
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