503.10.5 Clearance.
FGC § 503.10.5
Minimum clearances from vent connectors to combustible material shall be in accordance with Table 503.10.5. Exception: The clearance between a vent connector and combustible material shall be permitted to be reduced where the combustible material is protected as specified for vent connectors in Table 308.2. Table 503.10.5 aClearances for Connectors Appliance Minimum Distance from Combustible MaterialListed Type B Gas Vent Material Listed Type L Vent Material Single-Wall Metal Pipe Factory- Built Chimney Sections Appliance Minimum Distance from Combustible MaterialListed Type B Gas Vent Material Listed Type L Vent Material Single-Wall Metal Pipe Factory- Built Chimney Sections Listed appliances with draft hoods and appliances listed for use with Type B gas ventsAs listed As listed 6 inches As listed Residential boilers and furnaces with listed gas conversion burner and with draft hood6 inches 6 inches 9 inches As listed Residential appliances listed for use with Type L ventsNot permitted As listed 9 inches As listed Listed gas-fired toiletsNot permitted As listed As listed As listed Unlisted residential appliances with draft hoodNot permitted 6 inches 9 inches As listed Residential and low-heat equipment other than aboveNot permitted 9 inches 18 inches As listed Medium-heat appliancesNot permitted Not permitted 36 inches As listed For SI: 1 inch = 25.4 mm. a. These clearances shall apply unless the manufacturer's installation instructions for a listed appliance or connector specify different clearances, in which case the listed clearances shall apply.
