Refer to Table 3-3 in the 1997 UMC, chimney and vent connector clearances. A listed residential water heater with a draft hood has a chimney connector made of single wall metal pipe. What minimum clearance is required between tthe connector and any unprotected combustible materials?

Refer to Table 3-3 in the 1997 UMC, chimney and vent connector clearances. A listed residential water heater with a draft hood has a chimney connector made of single wall metal pipe. What minimum clearance is required between tthe connector and any unprotected combustible materials?