N.Y.C. Admin. Code § FGC 506: Section FGC 506: Factory-Built Chimneys

506.1 Building heating appliances.

Factory-built chimneys for building heating appliances producing flue gases having a temperature not greater than 1,000°F (537.8°C), measured at the entrance to the chimney, shall be listed and labeled in accordance with UL 103 and shall be installed and terminated in accordance with the manufacturer's instructions and this code.

506.2 Support.

Where factory-built chimneys are supported by structural members, such as joists and rafters, such members shall be designed to support the additional load.

506.3 Medium-heat appliances.

Factory-built chimneys for medium-heat appliances producing flue gases having a temperature above 1,000°F (537.8°C), measured at the entrance to the chimney, shall be listed and labeled in accordance with UL 959 and shall be installed and terminated in accordance with the manufacturer's instructions and this code.