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Unless the conditions in Section 506.10.3 exist, duct systems and system components handling combustible material shall have a clearance of not less than 18 inches (457 mm) from combustible construction or a combustible material. [NFPA 91:4.7.2]

Related Code Sections

506.10.2 Exhaust Systems, Systems Conveying Combustible Materials
Unless the conditions in Section 506.10.3 exist, duct systems and system components handling combustible material shall have a clearance of not less ...
506.0 Exhaust Systems, Product-Conveying Ducts
Materials used in product-conveying duct systems shall be suitable for the intended use and shall be of metal. Exceptions: Asbestos-cement ...