Every appliance designed with a draft hood shall have a draft hood installed in the position for which it was designed and shall be located so that the draft hood relief opening is at least 6 inches from any surface other than the appliance it serves, measured in a direction 90 degrees to the plane of the relief opening. When a greater clearance is indicated by the appliance approval, as shown on the appliance label, the greater clearance shall be provided. (NFPA 54, 12.13.7). The draft hood shall be in the same room as the combustion air opening of the appliance. (NFPA 54, 12.13.5).
