503.10.2.3.2 Low-heat appliances.
FGC § 503.10.2.3.2
A vent connector for low-heat appliances shall be a factory-built chimney section or steel pipe having resistance to heat and corrosion equivalent to that for the appropriate galvanized pipe as specified in Table 503.10.2.4. Factory-built chimney sections shall be joined together in accordance with the chimney manufacturers' instructions. Table 503.10.2.4Minimum Thickness for Galvanized Steel Vent Connectors for Low-Heat Appliances Diameter of Connector(inches)Minimum Thickness(inch)Less than 6 0.019 6 to less than 10 0.023 10 to 12 inclusive 0.029 14 to 16 inclusive 0.034 Over 16 0.056 For SI: 1 inch = 25.4 mm. (Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023) Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077.













